420.An incorrect connection will cause damage.

A. 当飞机处于常态速度和巡航仰角时,通气油箱内的燃油将排放到主燃油箱内。

B. 当飞机处于恒定速度和巡航俯仰角时,通气油箱内的燃油将排放到主燃油箱内。

C. 当飞机处于超常速度和巡航俯仰时,通气油箱内的燃油将排空到主燃油箱内。

A. When fuel comes out,you should perpare for fire eliminating.

B. It is necessary to exterminate fire properly when fuel starts to leak.

C. Use a fire extinguisher immediately if there is fuel leakage.

A. A maximum distance of 50 feet is required between consumable materials and the work area.

B. Keep flammable materials at a minimum distance of 50 feet from the work area.

C. Explosive materials must be kept at least 50 feet away from the work area.

A. Let the substance become hard.

B. Let the adhesive become hard.

C. Let the admixture become hard.

A. 飞机或其系统的缺陷经常被第三方给出文字描述。

B. 总的来说,对飞机或系统的排故不受第三方的限制。

C. 一般来说,在描述飞机或其系统时,应该使用第三人称。

A. 应说明燃油的总量和可用燃油量,如果燃油可用量超过 FAR 23 部的限制,还应说明原因。

B. 应说明油箱容量和可用燃油量,如果不可用燃油量超过 FAR 23 部规章的限制,还应提供用于确定飞行中不可用燃油量的相关信息。

C. 燃油的总容量如果超出了 FAR 23 部的规定,还应确定飞行中不可用燃油的数量。

D. C.燃油的总容量如果超出了 FAR 23 部的规定,还应确定飞行中不可用燃油的数量。

A. The connector has 32 contacting points.

B. The contact has 32 contactors.

C. The contactor has 32 contacts.

A. Each door has flexible seals at its structure interface which protect the metal interfaces from damage by the airflow.

B. Each door has flexible seals at its structure interface which protect the metal interfaces from no damage by the airflow.

C. Each door has formalist seals at its structure interface which protect the metal interfaces from damage by the airflow.

A. Do a hardness test for turning tool.

B. Conduct a hardness test for the carbide insert.

C. Take a hardness test for the chuck.

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。