491、This Specification refers to various FAA regulations.

A. 　 The basis for assuring an airplane remains airworthy and safe to operate is, to combine the manufacturer's
requirement Switch sound inspection and maintenance practices.

B. 　 To ensure airworthiness and safe operation of an airplane,
instructions in the utilization of airplane and perform sound inspection and maintenance practices as well.

C. 　 Airworthiness and safe operation are fundamental to aircraft utilization as required by the manufacturer,
so sound inspection and maintenance/practices are carried out.

A. 　基本的控制与操作资料描述了飞机各部件和系统的控制和操作的情况,包括所使用的专用程序和限制规定。

B. 　基本的控制与运营资料描述了飞机各部门和系统是怎样控制和运营的,包括所申请的专用程序和限制规定。

C. 　基本的控制与操作资料描述了飞机各部件和系统是怎样控制和操作的,包括适用的专用程序和限制规定。

A. 　 Turn the knob clockwise to decrease the intensity of the light.

B. 　 Turn the knob counterclockwise to decrease the intensity of the light.

C. 　 In order to turn the knob clockwise, decrease the intensity of the light

A. 　隔离引起故障的部分。

B. 　隔离部件产生了故障。

C. 　引起故障的部分已经被隔离

A. 　如果测试失败,应该根据困难决定修理的内容。

B. 　 如果测试结果不合格,应该根据故障决定修理的深度。

C. 　 如果测试结果失效,应该根据故障决定修理的难度。

A. 　拆卸保留的封严。

B. 　移动残留的防渗漏剂。

C. 　清除剩余的密封胶。

A. 　 Grab a plier to release the clips.

B. 　 Grab a screwdriver to release the bolts.

C. 　 Grab a screwdriver to release the clips.

A. 　如果您认为雪堆会倾倒,请确保车辆处于适用的配置。

B. 　如果您认为会下雪,请确保车辆处于适用的配置。

C. 　如果您认为会下雪,请确保车辆处于应用限制。

A. 　 Make sure that the BLEED pushbutton switch is closed (the ON icon is off)

B. 　 Make sure that the BLEED pushbutton switch is opened(the ON mark is off).

C. 　 Make sure that the BLEED pushbutton switch is released (the ON legend is off).
参考 C

A. 　 Always use test element that can cause sparks.

B. 　 Never use test equipment which1can cause cracks

C. 　 Do not use test equipment that can cause sparks.