Turn the potentiometer until the light is dim.

A. Remove the smooth areas with cotton cloth if you find them.

B. If you find alligatored areas, remove them with cotton cloth.

C. If there are rough areas, remove them with emery cloth.

A. 航行灯从熄灭变为明亮。

B. 转弯灯从熄灭变为暗亮。

C. 航行灯从暗亮变为明亮。

A. 放目录页的桌子必须标识日期但是无需编号。

B. 目录页必须写日期但是不用写数量。

C. 目录页必须注明日期，但无需编号。

A. 膝盖连接处使钢筋板更加强劲。

B. 重叠接头使加固板强度更大。

C. 加强板可以增加搭接处的强度。

A. When simulating altitude, make sure you have alternate ATC transponders in active mode.

B. Make sure that the ATC transponders are in standby mode when you simulate altitude.

C. It is optional to keep the ATC transponders in ready mode during altitude simulation.

A. Explain when there is any change to the weight or force distance of the airplane, how to keep this record so as to acquire right starting data by calculating the weight and c.g. during normal operation of the airplane.

B. Explain how to maintain this record when changes to the weight or moments of the airplane are made so that accurate starting data is available to calculate the weight and c. g. during normal operation of the airplane.

C. In order to get correct starting data during abnormal operation of the airplane, the weight and c. g. should be calculated and explain how to keep this record when there are changes to the weight or moments of airplane.

A. Apply special materials in all the holes, specially in the area which can have condensation.

B. Paint special materials in all the holes, especially in the freezing area.

C. Fill special materials in all the holes, particularly for the frost area.

A. Charge the battery.

B. Discharge the battery.

C. Inflate the battery.

A. 当有金属碎片时必须检查临近的泵。

B. 当发现金属痕迹时，必须检查所有的泵。

C. 当发现金属碎屑时，必须检查相应的泵。

A. 如果第9节载明了限制条件，那么在本节应包括一条说明，向读者说明可从其中查阅可选系统或设备的限制条件。

B. 如果第9节包含了限制条件，那么其中应对可选系统或设备的限制条件进行说明，供读者参考。

C. 如果第9节给出了限制条件，则那些可供选择的系统或设备应说明符合这些限制条件，可供读者参考。