1、用柔软的干布快速摩擦表面。

A. 　在这个标题下,列出各个零件和部件中必要的问题,以便将必要的注意事项或关键点隔离开来。

B. 　在这个标题下,列出各个零件和部件中必要的注意事项或关键虑£以便将必要的问题隔离开来。

C. 　在这个标题下,列出所有必要的注意事项或关键点,以便将各个零件和部件中的问题隔离出来。

A. 　Some reports were used to select items that were distinctive in application,design and loading and even no failures have occurred.

B. 　Some reports were used to select familiar application,design and loading even if no failures have occurred.

C. 　Some reports were used to select items that were alike in application,design and loading even though no failures have occurred.

A. 　Distances shown are based on weak wind.

B. 　Distances shown are developed with no wind.

C. 　Distances shown are on the basis of gentle wind.

A. A.Pressurize the system to 150 bar with the hydraulic pump.

B. B.Pressurize the system to 150 bar with the hand pump.

C. C.Pressuring the system to 150 bar with the hand pump.

A. 　If there is hum from the loudspeaker,don＇t adjust the potentiometer.

B. 　Adjust the potentiometer unless hear a hum from the loudspeaker.

C. 　Adjust the potentiometer until the loudspeaker no longer hums.

A. 　If the engine appears to be heating,turn it off.

B. 　If the engine appears to be overheating,turn it off.

C. 　If you think the engine is too hot,turn the switch to”off”＇.

A. 　Rub the surface with a soft,dry cloth.

B. 　Rub the surface slowly with a soft,dry cloth.

C. 　Rub the surface quickly with a soft,dry cloth.

A. 　能防止自由运动的活塞在套筒中有划伤

B. 　刻痕能阻止活塞在套筒中的自由运动。

C. 　刻痕能防止自由运动的活塞在套筒中。

A. 　使用具有良好硬度特性和足够重量和质量的白纸,以消除双面打印时多余的透视显示(透印)。

B. 　使用具有良好力量特性和足够重量和质量的白纸,以消除双面打印时多余的透视显示(透印)。

C. 　使用具有良好强度特性和足够重量和质量的白纸,以消除双面打印时多余的透视显示(透印)。

A. 　While you do the valve test,ensure that there is no contamination.

B. 　While you do each step of the valve test,ensure that there is no blockage

C. 　While you do each step of the valve test,make sure that there is no leakage.