1968.Equipment without significant effect on the weight or balance of the airplane need not be listed.

A. 这些单位和组件收集、监管、并向乘客和空乘人员输送氧气。

B. 这些组件和部件用于储存、调节并向乘客和机组人员输送氧气。

C. 这些单位和组件储存、管制、并向乘客和地面机组输送氧气。

A. 只有字典里没有出现的技术名词或者技术名词的一部分可以使用。

B. 对于词典中未批准的词,只有当它是技术名称或技术名称的一部分时才可以使用。

C. 仅当一个单词完全或部分是技术名词时,字典中未被批准的单词才可以使用。

A. 如果你得到了一个不需要的移动,做系统测试。

B. 对于非指令运动,需要使用该系统进行测试。

C. 出现非指令运动时,对系统进行测试。

A. The description could be pronounced in the active voice.

B. Descriptive content can be written in active voice.

C. You should read it in voice as you write the descriptive text.

A. The drain float valves in the vent tubes and the vent channels dilute the fuel in the vent system to drain out of the tank when the fuel face is lower than the valve.

B. The drain float valves in the vent tubes and the vent channels permit fuel in the vent system to drain into the tank when the fuel level is lower than the valve.

C. The drain float valves in the vent tubes and from the vent channels allow the fuel in the vent system to drain into the tank when the fuel quantity is lower than the valve.

A. If the brackets are not damaged,continue the procedure.

B. In the absence of damage to the brackets,recall the process.

C. When bracket damage occurs,recall the procedure.

A. Write the instructions in the mandatory mode.

B. Write the instructions in the imperative form.

C. Write the instructions in the active mode.

A. Make sure that chemical compound are not near the engine nozzle.

B. Make sure that solvents are not near the engine exhaust.

C. Make sure that there's no isopropyl alcohol near the engine exhaust port.

A. 交流电源系统设计避免同一个电源同时给两个负载供电。

B. 交流电源系统设计防止两个电源同时向同一负载供电。

C. 备用电源系统被设计成避免两个电源同时向同一用户供电。

A. 给凸起的固定环和堵塞指示器打保险。

B. 给滚花固定环和堵塞指示器本体打保险。

C. 给带凸边的密封环安装保险丝,以固定指示器本体。