1990.Audio Integrating controls the output of communications and navigation receivers into the flight crew headphones and speakers,and the output of the flight crew microphones into the communications transmitters.

A. In flight deck,once you set probe heater switches on the overhead panel automatically,all the heater lights flash.

B. Make sure probe heater switches on the overhead panel in flight deck are in AUTO position and all the heater lights illuminate.

C. Set probe heater switches on the overhead panel in cockpit in AUTO position so that all the heater lights come into view.

A. 安装程序中,请佩戴防护罩。

B. 焊接过程中,请佩戴防护罩。

C. 在拆卸程序中,请佩戴防护罩。

A. 每一个点处的宽度和深度值不能小于 30。

B. 每一个点处的宽深值不能大于 30。

C. 每一个点处的宽深比不少于 30。

A. In any process,the velocity is not large.

B. Do not increase this speed in any operation.

C. In any operation,the speed can not be greater than this value.

A. Setting cable tension,flight control surfaces travel limitsand stops are the main tasks of rigging.

B. Cable tension set,flight controls travel limits adjustment and travel stops set are the rigging procedures.

C. Rigging involves setting cable tension,adjusting travel limits of flight controls,and setting travel stops.

A. 在运转的发动机附近时,必须佩戴听力保护装置。

B. 当你在附近要运转发动机时,你必须要带耳罩。

C. 当你靠近正在运转的发动机时,你必须保护耳朵。

A. The properties of these sealants prevent corrosion.

B. Corrosion frequently occurs due to the features of these sealants.

C. The properties of these sealants make themselves easily corroded.

A. The pump is installed behind the hydraulic motor.

B. The gearbox is installed behind the pneumatic motor.

C. Thehydraulic motor is installed behind the pump.

A. 说明如何保持此记录,以便更改飞机的重量或力矩时,或在飞机正常运行时可以使用准确的起始数据来计算重量和重心。

B. 说明在更改飞机的重量或力矩时如何保持此记录,以便在飞机正常运行期间可以使用重量和平衡来准确计算起始数据。

C. 说明当飞机重量或力矩发生改变时如何进行记录,以便在飞机正常运行期间能够为计算重量和平衡提供准确的起始数据。

D. C.说明当飞机重量或力矩发生改变时如何进行记录,以便在飞机正常运行期间能够为计算重量和平衡提供准确的起始数据。

A. 注释会引起注意方式方法,这个能让工作更简单,或者提供说明或者注释信息的方法。

B. 注释提醒注意使工作更容易的方法,或提供说明或额外解释信息的方法。

C. 注释提醒注意使工作更容易的方法,或提供补充或解释信息的方法。