操作调光开关，确保光的强度发生变化。

A. Write the instructions in the mandatory mode.

B. Write the instructions in the imperative form.

C. Write the instructions in the active mode.

A. Land navigation includes items such as DM, transponders, fluxgate compass, LORAN, VOR, ADF, etc.

B. Independent Position Determining includes items such as DME, transponders, radio compass, LORAN, VOR, DF, etc.

C. Dependent Position Determining includes items such as DME, transponders, radio compass, LORAN, VOR, ADF, etc.

A. 关键字、开关及杠杆在“条件栏”大写。

B. 大写关键词的开关和杠杆位置。

C. “条件栏”中的关键字或开关及手柄位置使用大写。

A. 当反推收回时，确保飞机远离人员。

B. 当反推放出时，确保人员远离飞机。

C. 当反推运动时，确保人员远离飞机。

A. This is the portion of the systems used to generate, regulate, control, and indicate AC electrical power.

B. Here is that portion of the systems used to generate, regulate, control, and indicate AC electronic power.

C. That is the portion of the systems used to generate, increase, control, and indicate AC electrical power.

A. Landing gear position has no effect on stall speeds.

B. The position of the landing gear doesn＇t influence the surging speed.

C. The idle speed is not effected by the landing gear position.

A. 本节应包括相应的告诫， 提醒不得使用未经批准的清洁剂以及使用经批准的清洁剂可能伴有的危险源。

B. 本节应包括相应的告诫，提醒使用未经授权的清洁剂以及使用授权清洁剂的可能危害的注意事项。

C. 本节应提供关于使用未经授权的洗涤剂以及使用授权洗涤剂的可能危害的注意事项。

A. 在程序中，提供简短，清晰的指令并且直接向读者讲话。

B. 在程序中给出简短，清晰的指令，直接向读者陈述。

C. 在程序执行中，要向读者直接发话，给出简短清晰的指令。

A. 调整倾斜仪，直到气泡位于中心。

B. 在倾斜仪上的气泡位于中心后进行调整。

C. 将倾斜仪调整到气泡的中心位置。

A. The system is pneumatically operated and mechanically controlled.

B. Hydraulic power drives the system, while electricity is connected.

C. The system is hydraulically operated and electrically controlled.