Put your hand on the fan to feel for vibration. If you feel vibration, the fan is on.

A. 检查油管，对于磨损的区域。

B. 磨削管道并检查。

C. 检查管道是否磨损。

A. A small child should sit in an unlimited seat.

B. A small child needs to sit in a seat with safety device.

C. A small child could sit in an adult seat.

A. 警告和注释可用来突出或强调重要的内容。

B. 警告、谨慎和注意可用来突出或强调重点要点。

C. 警告、告诫和注意可用来突出或强调重点要点。

A. Some jobs or processes consist of several basic operations, with a number of minor steps or work items under each.

B. Some basic operations with a few small steps or work items are included in some work or processes.

C. Some jobs or processes constitute a few basic operations, with several minor steps or work items under each.

A. Before you use a word, read its definition in the approved meaning column of the dictionary.

B. Before you use a word, read its approved meaning in the definition column of the dictionary.

C. Before you use a word, read its meaning in the approved column of the dictionary definition.

A. When stop the engine, make sure that the engine decelerates to 500 RPM.

B. If the engine decreases to 500 RPM, you must stop it.

C. When the engine RPM decreases 500, you＇d better stop the engine.

A. 在记录发动机故障时写下发动机温度。

B. 把温度写在发动机记录卡上。

C. 温度信息需要参考发动机记录卡。

A. The paper must include a three-looking picture of the unit.

B. The report must inclue a three- view drawing of the unit.

C. The diagram must include a three-side drawing of the unit.

A. 电瓶为紧急出口的照明电路供电。

B. 闭合电瓶电路给应急出口灯供电。

C. 应急出口灯由电瓶电路控制。

A. 在此过程中，使用12英寸螺刀手柄。

B. 在此过程中，使用12英尺扳手手柄。

C. 在此过程中，使用12英寸扳手手柄。