539.The schematic diagram should tend to deal with an overall system
rather than with subsystems, e.g., the air conditioning system rather
than a compressor or blower within the air conditioning system.

A. 　 Those units means that they can prevent it from eroding.

B. 　 Those units provide a method of deicing.

C. 　 Those units provide away to prevent the formation of ice.

A. 　、 As only approved limitations may be excluded in this Section,an
introductory statement to this effect shall be contained in a prefatory
note or the opening paragraph.

A. 　GO INTO

B. 　CIRCULATE

C. 　FLOW

A. 　within night operation, make sure the panel lights are dim.

B. 　During night operation, make sure the panel lights are bright.

C. 　During night operation, make sure the panel lights are dim.

A. 　维修手册中准备某些章节的技术数据需要机身制造商和各种其它部件制造商
之间的共同贡献和密切协作。

B. 　编写维修手册某些章节的技术资料时,需要机身制造商和各种其他部件制造商
之间的共同协作。

C. 　机身制造商和各种其他部件制造商可以共同协作以完成维修手册,一些章节的
技术参数的编写工作。

A. 　控制单元安装在驾驶室后部。

B. 　控制组件安装在驾驶舱的后部。

C. 　控制组件安装在飞行舱之后。

A. 　If you must add pages after the ahead printing, then the page should
have the number of the preceding page and an alphabetic suffix.

B. 　In the event a page must be added pursuant to the original printing,
the page shall carry the number of the preceding page with a letter suffix
added.

C. 　If you must add pages after the individual printing, then the page should
contain the serial number of the preceding page,and add a suffix letters.

A. 　KEEP

B. 　HOLD

C. 　MAINTAIN

A. 　如果组件变得很干净,那么组件的寿命将会增加。

B. 　如果组件变得很脏,那么将降低组件的使用率。

C. 　如果组件变得很脏,那么组件的寿命将会缩短。

A. 　if you must go near the engine exhaust, use ear protection.

B. 　if you must go to the engine exhaust, use ear protection.

C. 　if it is necessary to approach the engine exhaust, do ear protection.