1383. If the humidity changes frequently, put a cover on the unit

Cover the unit when the humidity keeps changing.

If the humidity variable frequently, put a cover on the unit.

If humidity content is variable, cover the unit.

正确答案：B

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1980. Other procedures essential or pertinent to the operation of the airplane may be included in the Handbook

1979. 确保地面勤务车的排气不会造成错误的指示

1978. 系统中向座舱提供压缩空气的部分及其控制装置。包括与压气机相关的控制和指示系统等项目,如适用。不包括客舱增压的压力控制和指示系统。

1977. 系统中显示由脉冲编码传输而来的信息的部分。包括电报机、选择呼叫系统,呼叫选择系统等。

1976. If the aircraft is parked on a slope, make sure that wheel chocks are in position

1975. 每一章或每一节都是以这个系统及其操作的一般描述开始,并应称为“描述和操作“。

1974. 等第一层油漆完全干透后再涂第二层。

1973. If the instrument does not operate correctly, do a test

1972. If you think that snow will fall, make sure that the vehicle is in the applicable configuration

1971. The section containing Emergency Procedures” shall have a red plasticized tab divider"