埋在地下的树根使树枝产生了果实，却并不要求什么回报。（泰戈尔）
R900409898 ZDB6VP2-4X/315V力士乐溢流阀
博世力士乐 液压阀 开/关阀 Bosch Rexroth 压力阀 溢流阀 阀门
R900409898 ZDB6VP2-4X/315V ZDB6VP2-4X/315V力士乐先导式溢流阀
R900409898 ZDB6VP2-4X/315V ZDB6VP2-4X/315V力士乐先导式溢流阀
Bosch Rexroth Industrial Hydraulics
博世力士乐工业液压
On/off valves
开/关阀
Pressure valves
压力阀 压力控制阀
Pressure relief valve, pilot controlled
先导式溢流阀
ZDB 6, Z2DB 6
- Size 6
- Component series 4X
- Maximum operating pressure 315 bar
- Maximum flow 60 l/min
Features
- Sandwich plate valve
- Porting pattern according to ISO 4401-03-02-0-05 (with or without locating hole)
- 4 pressure ratings
- 5 circuit options
- With 1 or 2 pressure valve cartridges
- 4 adjustment types for pressure adjustment, optionally
  ·Rotary knob
  ·Sleeve with hexagon and protective cap
  ·Lockable rotary knob with scale
  ·Rotary knob with scale
- Corrosion-protected design
博世力士乐先导式溢流阀
R900409847 ZDB6VP2-4X/50V
R900409933 ZDB6VP2-4X/100V
R900409844 ZDB6VP2-4X/200V
R900409898 ZDB6VP2-4X/315V
R900422752 ZDB10VP2-4X/50V
R900409959 ZDB10VP2-4X/100V
R900409937 ZDB10VP2-4X/200V
R900409958 ZDB10VP2-4X/315V
博世力士乐 液压阀 开/关阀 Bosch Rexroth 压力阀 溢流阀 阀门
R900409898 ZDB6VP2-4X/315V ZDB6VP2-4X/315V力士乐先导式溢流阀
R900409898 ZDB6VP2-4X/315V ZDB6VP2-4X/315V力士乐先导式溢流阀
供应商信息：武汉亿嘉隆机电设备有限公司
Attn：袁荣
：

：
：
僵卧孤村不自哀，尚思为国戍轮台。（陆游《十一月四日风雨大作》）
R900409898 ZDB6VP2-4X/315V力士乐溢流阀
博世力士乐 液压阀 开/关阀 Bosch Rexroth 压力阀 先导式溢流阀 阀门 插装阀
Bosch Rexroth Industrial Hydraulics
博世力士乐工业液压
On/off valves
开/关阀
Pressure valves
压力阀 压力控制阀
Pressure relief valve, pilot controlled
先导式溢流阀
ZDB 和 Z2DB 型
- 通径 6 和 10
- 4X 系列
- zui高工作压力 315 bar
- zui高流量 60 L/min

型号 ZDB 6 VP2-4X/...

特征
- 插装阀
- 安装面按 DIN 24340 A 型，不带定位销孔（标准型）
- 安装面按 ISO 4401 和 CETOP-RP 121 H，带定位销孔（订货详情.../60在阀的订货型号zui后）
- 4 种压力范围
- 5 种可选的有效流向
- 带一个或两个插装溢流阀
- 4 种调节元件
  ·旋钮
  ·带护罩的六角套筒螺钉
  ·带锁有刻度旋钮
  ·不带锁有刻度旋钮

博世力士乐液压阀
先导式溢流阀
ZDB 和 Z2DB 型
订货型号
"Z*DB6**-4X/*V**"
"Z"--叠加式结构
"*"--2 = 到2个插装溢流阀（仅用于“VC”和“VD”型）
"DB"--溢流阀
"6"--6 = 通径 6
"*"--溢流功能从 - 至：
  VA = A - T
  VP = P - T
  VB = B - T
  VC = A - T 和 B - T
  VD = A - B 和 B - A
"*"--调节元件：
  1 = 旋钮
  2 = 带护罩的六角套筒螺丝
  3 = 带锁有刻度旋钮
  7 = 不带锁有刻度旋钮
"4X"--4X = 40至49系列
  40 至 49：安装和连接尺寸保持不变
"*"--压力级：
  50 = 压力可调至50bar
  100 = 压力可调至100bar
  200 = 压力可调至200bar
  315 = 压力可调至315bar
"V"--密封：
  V = 氟橡胶密封（其他密封按要求）
  注意：必须考虑密封和流体介质的协调性！
"*"--无代码 = 不带定位销
  /60 = 带定位销孔
"*"--明文形式的更多详细信息

力士乐先导式溢流阀
*型号（可随时供货）
R900409889 ZDB6VA2-4X/100V
R900409886 ZDB6VA2-4X/200V
R900409893 ZDB6VA2-4X/315V
R900409854 ZDB6VB2-4X/200V
R900409896 ZDB6VB2-4X/315V
R900409847 ZDB6VP2-4X/50V
R900409933 ZDB6VP2-4X/100V
R900409844 ZDB6VP2-4X/200V
R900409898 ZDB6VP2-4X/315V

R900411312 Z2DB6VC2-4X/200V
R900411318 Z2DB6VC2-4X/315V
R900411317 Z2DB6VD2-4X/100V
R900411314 Z2DB6VD2-4X/200V
R900411357 Z2DB6VD2-4X/315V

Bosch Rexroth Pressure Valves
博世力士乐压力阀
压力控制阀（先导式）
R901075331 DBW10A1-5X/100-6EG24N9K4
R900941174 DBW10A1-5X/200-6EG24N9K4
R900965477 DBW10A1-5X/315-6EG24N9K4
R900948450 DBW10A2-5X/100-6EG24N9K4
R900926249 DBW10A2-5X/200-6EG24N9K4
R900926054 DBW10A2-5X/315-6EG24N9K4
R900921225 DBW10B1-5X/100-6EG24N9K4
R900923103 DBW10B1-5X/200-6EG24N9K4
R900920863 DBW10B1-5X/315-6EG24N9K4
R900906650 DBW10B2-5X/100-6EG24N9K4
R900912910 DBW10B2-5X/200-6EG24N9K4
R900906285 DBW10B2-5X/315-6EG24N9K4
R900963111 DBW20A1-5X/100-6EG24N9K4
R900941175 DBW20A1-5X/200-6EG24N9K4
R900939736 DBW20A1-5X/315-6EG24N9K4
R900919583 DBW20A2-5X/100-6EG24N9K4
R900939204 DBW20A2-5X/200-6EG24N9K4
R900921754 DBW20A2-5X/315-6EG24N9K4
R900941177 DBW20B1-5X/100-6EG24N9K4
R900935659 DBW20B1-5X/200-6EG24N9K4
R900920619 DBW20B1-5X/315-6EG24N9K4
R900922308 DBW20B2-5X/100-6EG24N9K4
R900912860 DBW20B2-5X/200-6EG24N9K4
R900907684 DBW20B2-5X/315-6EG24N9K4
先导式溢流阀
R900590646 DB10-2-5X/100
R900587772 DB10-2-5X/200
R900590334 DB10-2-5X/315
R900589433 DB20-2-5X/100
R900590768 DB20-2-5X/200
R900593530 DB20-2-5X/315
先导式溢流阀
R900409847 ZDB6VP2-4X/50V
R900409933 ZDB6VP2-4X/100V
R900409844 ZDB6VP2-4X/200V
R900409898 ZDB6VP2-4X/315V
R900422752 ZDB10VP2-4X/50V
R900409959 ZDB10VP2-4X/100V
R900409937 ZDB10VP2-4X/200V
R900409958 ZDB10VP2-4X/315V
先导式减压阀
R900409967 ZDR6DP1-4X/75YM
R900410806 ZDR6DP1-4X/150YM
R900476381 ZDR6DP1-4X/210YM
R900506336 ZDR6DP1-4X/75YMV
R900450066 ZDR6DP1-4X/150YMV
R900426183 ZDR6DP1-4X/210YMV
R900483786 ZDR6DP2-4X/75YM
R900483787 ZDR6DP2-4X/150YM
R900483788 ZDR6DP2-4X/210YM
R900452815 ZDR6DP2-4X/75YMV
R900476331 ZDR6DP2-4X/150YMV
R900400663 ZDR6DP2-4X/210YMV
R900410877 ZDR10DP1-5X/75YM
R900411247 ZDR10DP1-5X/150YM
R900411246 ZDR10DP1-5X/210YM
R900450298 ZDR10DP1-5X/75YMV
R900508341 ZDR10DP1-5X/150YMV
R900550022 ZDR10DP1-5X/210YMV
R900410875 ZDR10DP2-5X/75YM
R900410880 ZDR10DP2-5X/150YM
R900410876 ZDR10DP2-5X/210YM
R900429511 ZDR10DP2-5X/75YMV
R900431772 ZDR10DP2-5X/150YMV
R900487690 ZDR10DP2-5X/210YMV
R900409966 ZDR6DA1-4X/75Y
R900409981 ZDR6DA1-4X/150Y
R900457313 ZDR6DA1-4X/210Y
R900448506 ZDR6DA1-4X/75YM
R900493226 ZDR6DA1-4X/150YM
R900481036 ZDR6DA1-4X/210YM
R900410813 ZDR6DA2-4X/75Y
R900410849 ZDR6DA2-4X/150Y
R900410855 ZDR6DA2-4X/210Y
R900410815 ZDR6DA2-4X/75YM
R900445958 ZDR6DA2-4X/150YM
R900423213 ZDR6DA2-4X/210YM
R900415411 ZDR10DA1-5X/75Y
R900406178 ZDR10DA1-5X/150Y
R900433851 ZDR10DA1-5X/210Y
R900494714 ZDR10DA2-5X/75YM
R900406225 ZDR10DA2-5X/150YM
R900428474 ZDR10DA2-5X/210YM
……
捧着一颗心来，不带半棵草去。（陶行知）

博世力士乐 液压阀 开/关阀 Bosch Rexroth 压力阀 先导式溢流阀 阀门 插装阀
Bosch Rexroth Industrial Hydraulics
博世力士乐工业液压
On/off valves
开/关阀
Pressure valves
压力阀 压力控制阀
Pressure relief valve, pilot controlled
先导式溢流阀
ZDB 和 Z2DB 型
型号列举
ZDB6型先导式溢流阀
R900967505 ZDB6VA1-4X/50
R900583801 ZDB6VA1-4X/50V
R900527144 ZDB6VA1-4X/100
R900507526 ZDB6VA1-4X/100V
R900426313 ZDB6VA1-4X/200
R900433646 ZDB6VA1-4X/200V
R900509893 ZDB6VA1-4X/315
R900522027 ZDB6VA1-4X/315V
R900431678 ZDB6VA2-4X/50
R900406615 ZDB6VA2-4X/50V
R900437441 ZDB6VA2-4X/100
R900409889 ZDB6VA2-4X/100V
R900426329 ZDB6VA2-4X/200
R900409886 ZDB6VA2-4X/200V
R900431071 ZDB6VA2-4X/315
R900409893 ZDB6VA2-4X/315V
R900508780 ZDB6VA2-4X/350V
R900425683 ZDB6VA3-4X/50
R900598663 ZDB6VA3-4X/50V
R900428435 ZDB6VA3-4X/100
R900433335 ZDB6VA3-4X/100V
R900438967 ZDB6VA3-4X/200
R900403470 ZDB6VA3-4X/200V
R900460338 ZDB6VA3-4X/315
R900422828 ZDB6VA3-4X/315V
R900527458 ZDB6VA7-4X/50V
R900538386 ZDB6VA7-4X/100V
R900528589 ZDB6VA7-4X/200V
R901015320 ZDB6VA7-4X/315V
R900967506 ZDB6VB1-4X/50
R900580996 ZDB6VB1-4X/50V
R900967507 ZDB6VB1-4X/100
R900598152 ZDB6VB1-4X/100V
R901035634 ZDB6VB1-4X/100V/60
R900959754 ZDB6VB1-4X/200
R900518826 ZDB6VB1-4X/200V
R900909480 ZDB6VB1-4X/315
R900551788 ZDB6VB1-4X/315V
R900430645 ZDB6VB2-4X/50
R900422214 ZDB6VB2-4X/50V
R900431401 ZDB6VB2-4X/100
R900409936 ZDB6VB2-4X/100V
R900429509 ZDB6VB2-4X/200
R900409854 ZDB6VB2-4X/200V
R901347239 ZDB6VB2-4X/200V/60
R900422061 ZDB6VB2-4X/315
R900409896 ZDB6VB2-4X/315V
R900940177 ZDB6VB2-4X/350
R900438971 ZDB6VB3-4X/50
R900440160 ZDB6VB3-4X/50V
R900431167 ZDB6VB3-4X/100
R900433336 ZDB6VB3-4X/100V
R900465884 ZDB6VB3-4X/200
R900516958 ZDB6VB3-4X/200V
R900454880 ZDB6VB3-4X/315
R900564860 ZDB6VB3-4X/315V
R900552086 ZDB6VB7-4X/50V
R900503765 ZDB6VB7-4X/100V
R900518152 ZDB6VB7-4X/200V
R900907940 ZDB6VB7-4X/315V
R900507459 ZDB6VP1-4X/50
R900449008 ZDB6VP1-4X/50V
R900507970 ZDB6VP1-4X/100
R900586621 ZDB6VP1-4X/100V
R900447152 ZDB6VP1-4X/200
R900596138 ZDB6VP1-4X/200V
R900445935 ZDB6VP1-4X/315
R900598455 ZDB6VP1-4X/315V
R900432804 ZDB6VP2-4X/50
R900409847 ZDB6VP2-4X/50V
R900423274 ZDB6VP2-4X/100
R900409933 ZDB6VP2-4X/100V
R900747682 ZDB6VP2-4X/100V/60
R900428339 ZDB6VP2-4X/200
R900409844 ZDB6VP2-4X/200V
R900422075 ZDB6VP2-4X/315
R900409898 ZDB6VP2-4X/315V
R901101916 ZDB6VP2-4X/315V/60
R900561458 ZDB6VP2-4X/350V
R900432112 ZDB6VP3-4X/50
R900490094 ZDB6VP3-4X/50V
R900460711 ZDB6VP3-4X/100
R900422338 ZDB6VP3-4X/100V
R900422089 ZDB6VP3-4X/200
R900425879 ZDB6VP3-4X/200V
R900431561 ZDB6VP3-4X/315
R900433818 ZDB6VP3-4X/315V
R900501749 ZDB6VP7-4X/50V
R900424297 ZDB6VP7-4X/100
R900501299 ZDB6VP7-4X/100V
R900596168 ZDB6VP7-4X/200
R900503154 ZDB6VP7-4X/200V
R900597389 ZDB6VP7-4X/315V
R900520361 ZDB6VP7-4X/350V
……
欲为圣明除弊事，肯将衰朽惜残年。（韩愈《左迁至蓝关示侄孙湘》）
Bosch Rexroth Hydraulic Valves
博世力士乐液压阀
Pressure valves
压力阀 压力控制阀
Z2DB6型先导式溢流阀
R900967508 Z2DB6VC1-4X/50
R900554759 Z2DB6VC1-4X/50V
R900967509 Z2DB6VC1-4X/100
R900523754 Z2DB6VC1-4X/100V
R900967510 Z2DB6VC1-4X/200
R900514617 Z2DB6VC1-4X/200V
R900909476 Z2DB6VC1-4X/315
R900521130 Z2DB6VC1-4X/315V
R900461751 Z2DB6VC2-4X/50
R900481501 Z2DB6VC2-4X/50V
R900425648 Z2DB6VC2-4X/100
R900411315 Z2DB6VC2-4X/100V
R900431164 Z2DB6VC2-4X/200
R900411312 Z2DB6VC2-4X/200V
R900788023 Z2DB6VC2-4X/210V
R900425647 Z2DB6VC2-4X/315
R900411318 Z2DB6VC2-4X/315V
R901389851 Z2DB6VC2-4X/315V/60
R900509096 Z2DB6VC3-4X/50V
R900439928 Z2DB6VC3-4X/100
R900441459 Z2DB6VC3-4X/100V
R900440998 Z2DB6VC3-4X/200
R900437448 Z2DB6VC3-4X/200V
R900428805 Z2DB6VC3-4X/315V
R901265025 Z2DB6VC3-4X/315V/60
R978916643 Z2DB6VC7-4X/50V
R900528590 Z2DB6VC7-4X/100V
R900551706 Z2DB6VC7-4X/200V
R900538856 Z2DB6VC7-4X/315V
R900967511 Z2DB6VD1-4X/50
R900506335 Z2DB6VD1-4X/50V
R900967512 Z2DB6VD1-4X/100
R900523755 Z2DB6VD1-4X/100V
R900521398 Z2DB6VD1-4X/200
R900569169 Z2DB6VD1-4X/200V
R900529909 Z2DB6VD1-4X/315
R900967914 Z2DB6VD1-4X/315V
R900463267 Z2DB6VD2-4X/50
R900421937 Z2DB6VD2-4X/50V
R900422065 Z2DB6VD2-4X/100
R900411317 Z2DB6VD2-4X/100V
R900422422 Z2DB6VD2-4X/200
R900411314 Z2DB6VD2-4X/200V
R900422066 Z2DB6VD2-4X/315
R900411357 Z2DB6VD2-4X/315V
R900422212 Z2DB6VD3-4X/50
R900500657 Z2DB6VD3-4X/50V
R900442328 Z2DB6VD3-4X/100
R900500691 Z2DB6VD3-4X/100V
R900438962 Z2DB6VD3-4X/200
R900437449 Z2DB6VD3-4X/200V
R900599175 Z2DB6VD3-4X/315V
R900743351 Z2DB6VD7-4X/100V
R901080471 Z2DB6VD7-4X/200V
……
采得百花成蜜后，为谁辛苦为谁甜。（蜜蜂）
Bosch Rexroth Hydraulic Valves
博世力士乐液压阀
Pressure valves
压力阀 压力控制阀
ZDB10型先导式溢流阀
R901032480 ZDB10VA7-4X/315V
R900596905 ZDB10VP1-4X/100V
R900596771 ZDB10VA1-4X/315V
R900595254 ZDB10VB1-4X/200V
R900593768 ZDB10VT2-4X/200V
R900593169 ZDB10VB3-4X/50V
R900589823 ZDB10VA3-4X/315V
R900587577 ZDB10VA3-4X/100V
R900583303 ZDB10VP3-4X/100V
R900583297 ZDB10VB3-4X/200V
R900583145 ZDB10VP3-4X/200V
R900581302 ZDB10VB1-4X/200
R900565776 ZDB10VB1-4X/100V
R900562255 ZDB10VP7-4X/200V
R900560613 ZDB10VP3-4X/50V
R900550125 ZDB10VP7-4X/315V
R900534185 ZDB10VP2-4X/350V
R900522880 ZDB10VP3-4X/100
R900522100 ZDB10VA7-4X/200V
R900520338 ZDB10VP1-4X/50V
R900510491 ZDB10VA1-4X/100V
R900507069 ZDB10VA3-4X/50V
R900506739 ZDB10VA1-4X/200V
R900506373 ZDB10VB3-4X/100V
R900505827 ZDB10VT2-4X/315V
R900471657 ZDB10VP1-4X/200V
R900468215 ZDB10VA3-4X/200V
R900449071 ZDB10VA3-4X/200
R900442704 ZDB10VT2-4X/100V
R900439335 ZDB10VP3-4X/200
R901114420 ZDB10VA7-4X/100V
R901114418 ZDB10VB7-4X/50
R901032480 ZDB10VA7-4X/315V
R900967919 ZDB10VP1-4X/315
R900967534 ZDB10VT2-4X/200
R900967530 ZDB10VT1-4X/50
R900967527 ZDB10VP1-4X/100
R900967525 ZDB10VB2-4X/50
R900967524 ZDB10VB1-4X/100
R900967521 ZDB10VA1-4X/50V
R900927065 ZDB10VA1-4X/100
R900910338 ZDB10VB1-4X/315V
R900432106 ZDB10VA2-4X/50
R900431380 ZDB10VP3-4X/315V
R900431065 ZDB10VP2-4X/100
R900430984 ZDB10VA2-4X/315
R900430129 ZDB10VP3-4X/315
R900429149 ZDB10VT2-4X/50V
R900428936 ZDB10VT2-4X/50
R900428468 ZDB10VP2-4X/200
R900427434 ZDB10VA2-4X/100
R900425958 ZDB10VA3-4X/50
R900425927 ZDB10VP2-4X/315
R900425723 ZDB10VB2-4X/50V
R900425681 ZDB10VB2-4X/315
R900424559 ZDB10VP1-4X/200
R900424537 ZDB10VA2-4X/100V
R900423244 ZDB10VA2-4X/50V
R900422752 ZDB10VP2-4X/50V
R900422261 ZDB10VB2-4X/200
R900422215 ZDB10VB2-4X/200V
R900422189 ZDB10VA2-4X/200V
R900422073 ZDB10VB2-4X/100
R900421265 ZDB10VA2-4X/200
R900409959 ZDB10VP2-4X/100V
R900409958 ZDB10VP2-4X/315V
R900409956 ZDB10VB2-4X/315V
R900409955 ZDB10VA2-4X/315V
R900409951 ZDB10VB2-4X/100V
R900409937 ZDB10VP2-4X/200V
R900402018 ZDB10VP1-4X/315V
R900967527 ZDB10VP1-4X/100
R900906981 ZDB10VA3-4X/100
R900596905 ZDB10VP1-4X/100V
R900506373 ZDB10VB3-4X/100V
R900501258 ZDB10VA1-4X/200
R900432106 ZDB10VA2-4X/50
R900430984 ZDB10VA2-4X/315
R900428468 ZDB10VP2-4X/200
R900427434 ZDB10VA2-4X/100
R900425927 ZDB10VP2-4X/315
R900425681 ZDB10VB2-4X/315
R900424537 ZDB10VA2-4X/100V
R900422752 ZDB10VP2-4X/50V
R900422261 ZDB10VB2-4X/200
R900422215 ZDB10VB2-4X/200V
R900422189 ZDB10VA2-4X/200V
R900422073 ZDB10VB2-4X/100
R900409959 ZDB10VP2-4X/100V
R900409958 ZDB10VP2-4X/315V
R900409956 ZDB10VB2-4X/315V
R900409955 ZDB10VA2-4X/315V
R900409951 ZDB10VB2-4X/100V
……
我*的希望就是多有贡献。（白求恩）
Bosch Rexroth Hydraulic Valves
博世力士乐液压阀
Pressure valves
压力阀 压力控制阀
Z2DB10型先导式溢流阀
R900598834 Z2DB10VC3-4X/100V
R900598833 Z2DB10VD3-4X/100
R900587771 Z2DB10VD3-4X/315V
R900583299 Z2DB10VC3-4X/315V
R900583042 Z2DB10VD7-4X/315V
R900580734 Z2DB10VD7-4X/200
R900552548 Z2DB10VC1-4X/50V
R900523756 Z2DB10VD1-4X/315V
R900515778 Z2DB10VC7-4X/200V
R900510772 Z2DB10VC1-4X/100V
R900505079 Z2DB10VD1-4X/100V
R900500928 Z2DB10VD3-4X/200V
R900496390 Z2DB10VC2-4X/200V
R900479846 Z2DB10VD2-4X/50V
R900443479 Z2DB10VD1-4X/200V
R900441974 Z2DB10VC2-4X/50V
R900440550 Z2DB10VD2-4X/200
R901061609 Z2DB10VD7-4X100V
R900967917 Z2DB10VD1-4X/315
R900967915 Z2DB10VC1-4X/315
R900967519 Z2DB10VD1-4X/200
R900920715 Z2DB10VC7-4X/100V
R900722255 Z2DB10VC7-4X/315V
R900437272 Z2DB10VC1-4X/200V
R900435042 Z2DB10VC1-4X/200
R900431828 Z2DB10VC2-4X/315
R900430550 Z2DB10VC2-4X/200
R900426667 Z2DB10VC3-4X/200V
R900425928 Z2DB10VD2-4X/100
R900425700 Z2DB10VC2-4X/100V
R900422071 Z2DB10VC2-4X/100
R900411462 Z2DB10VD2-4X/315V
R900411430 Z2DB10VC2-4X/315V
R900411413 Z2DB10VD2-4X/100V
R900411358 Z2DB10VD2-4X/200V
R900408156 Z2DB10VD2-4X/315
R900967917 Z2DB10VD1-4X/315
R900967519 Z2DB10VD1-4X/200
R900583042 Z2DB10VD7-4X/315V
R900496390 Z2DB10VC2-4X/200V
R900440550 Z2DB10VD2-4X/200
R900431828 Z2DB10VC2-4X/315
R900411462 Z2DB10VD2-4X/315V
R900411430 Z2DB10VC2-4X/315V
R900411413 Z2DB10VD2-4X/100V
R900411358 Z2DB10VD2-4X/200V
R900408156 Z2DB10VD2-4X/315
……
读不在三更五鼓，功只怕一曝十寒。——郭沫若