Clean the outer surface with warm water.

A. 交流电源系统设计避免同一个电源同时给两个负载供电。

B. 交流电源系统设计防止两个电源同时向同一负载供电。

C. 备用电源系统被设计成避免两个电源同时向同一用户供电。

A. Compressed air will push contamination into the display unit.

B. The display unit will be contaminated by compressed air.

C. Air pressure will push the dirt into the display unit.

A. The function and operation of each unit in the system should be described. The location of the units shouldn’t be described.

B. The function, operation and location of each unit in the system should be deleted.

C. The function, operation and location of each unit in the system should be described.

A. 有些功能不存在。

B. 有些功能不可用。

C. 有些系统不可用。

A. Deflate the pressure of tire to the certain value.

B. Provide pressure with nitrogen to the required value for the tire.

C. Depressurize the tire to the demanded value.

A. 当该面积足够凉爽时，喷涂表面。

B. 当该区域足够凉时，抛光表面。

C. 当该区域足够凉时，喷涂表面。

A. 给装有泵的系统B提供液压。

B. 给系统B和泵提供液压。

C. 用泵给系统B提供液压。

A. Turn the drain valve counterclockwise to cause the fluid to stop flowing before the valve is pushed.

B. When you turn the drain valve counterclockwise, no fluid will flow until you push the valve in.

C. Make sure there is no fluid flowing after the valve is pushed, then turn the drain valve clockwise.

A. Warning is an operating procedure, inspection , repair or maintenance practice , which if not correctly followed, could result in personal injury , or loss of life.

B. You should obey the warning in an operation procedure, check, repair or maintenance practice, otherwise person injury or death will happen.

C. Warning in an operation procedure, inspection , repair or maintenance practice should be followed seriously, whereas may involve in personal injury , or loss of life .

A. 保留勤务部件，更换那些损坏的。

B. 报废损坏的部件后，保留所有可用的。

C. 保留所有可用的部件，报废那些损坏的。