It operates when the pressure applied in the opposite direction is more than a set value.

A. It includes items such as audio selector control panel, microphones, head­ phones, cockpit loud speakers, etc.

B. It includes items such as automatic selector control panel, interphones, head­ phones, cockpit loud speakers, etc.

C. It includes items such as audio selector control panel, microphones, head­ phones, cockpit speakers, etc.

A. 对于小部分飞机设计、操作或操纵特性所特有的紧急情况，应提供安全操作所必需的应急程序和其他相关信息。

B. 对于特定飞机设计、操作或操纵特性所关注的紧急情况，应提供安全操作所必需的应急程序和其他相关信息。

C. 对于特定飞机设计、操作或操纵特性所特有的紧急情况，应提供安全操作所必需的应急程序和其他相关信息。

A. To work with electrical cable, we need tools specifically vattmeter, amperemetres and ohm meters.

B. To work with electrical cable, vattmeter, amperemetres and ohm meters are helpful tools.

C. In order to work with electrical circuit, we need tools specifically voltmeter, amperemetres and ohm meters.

A. These instructions are required for towing aircraft in normal or abnormal conditions, such as from soft ground, wet or icy surfaces and in the case of engine is removing or aircraft is damaging.

B. These instructions are necessary for towing the aircraft under normal or abnormal conditions, such as from a wet or icy surface on a soft ground and when the engine is removed or the aircraft is damaged.

C. These instructions are necessary to tow or push the aircraft in normal or abnormal conditions such as towing from soft ground and slippery or icy surfaces, with engines removed, or aircraft damaged.

A. 对现有的分析进行了审查，以确定可能存在安全裕度较低的部件和区域。

B. 从分析结果发现，有部件和相关区域显示出安全性能较低的迹象。

C. 故障分析结果显示，某些部件和区域现有些安全指标达不到设计要求。

A. Do not lift the aircraft on jacks if the wind speed is more than 20 MPH.

B. Do not hoist the aircraft on chocks if the wind speed is more than 20 MPH.

C. Do not raise the aircraft on jacks if the wind speed is more than 20 km/h.

A. “数据传输”或“自动呼叫”系统，如选择呼叫，利用脉冲编码的传输来呈现信息.

B. “数据传输”或“自动呼叫”系统，如选择呼叫，用脉冲被编码的传输来呈现信息.

C. 在“数据传输”或“自动呼叫”系统中，如选择呼叫，信息的传递是通过用脉冲被编码实现的。

A. 副翼回到中立位后，确保其与襟翼齐平。

B. 扰流板回到原位后，保证和襟翼对齐。

C. 在副翼返回中心之后，保证它们和襟翼相连。

A. 衬板的厚度应该是初始翼梁衬垫的厚度的1-1.2倍。

B. 加强条的厚度乘以1-1.2就得到初始长桁衬垫的厚度。

C. 压条的厚度应是初始长桁衬垫的厚度的1-1.2倍。

A. 在起落架和舵面锁的使用、最小转弯半径、对前起落架的最大拖动载荷等方面的安全须知和限制

B. 在起落架的使用、舵面锁、最小转弯半径、对前起落架的最大拖动载荷等方面的安全须知和限制

C. 在起落架锁和舵面锁的使用、最小转弯半径、对前起落架的最大拖动载荷等方面的安全须知和限制