The system to be tested operated abnormally during last flight leg.

A. 门是由碳纤维复合塑料制成的。

B. 门的主要成分是碳纤维复合材料。

C. 门是由碳纤维增强塑料制成的。

A. The inlet door actuator is installed aft of the rear pressure bulkhead on the inner side of the air inlet door.

B. The air inlet actuator is mounted on the side of the pressure bulkhead behind the intake valve.

C. The air release actuator is located on top of the pressure bulkhead inside the intake valve.

A. 检查厕所快速增压装置。

B. 检查厕所快速减压装置。

C. 检查厕所定期减压装置。

A. 可以理解的是，在某些情况下，遵守上述规定会导致重复测试程序，这是可以接受的。

B. 为了符合上述程序，有时会导致进行重复测试，这是可以接受的。

C. 可以理解为，符合上述要求就会导致接受重复测试程序。

A. The function of the portable water system is to store and send drinking water to the passengers.

B. The potable water system must keep and transfer the water to the toilet for washing only.

C. The purpose of the drinking water system is to store and deliver the water for drinking.

A. Oxidation occurs very easily.

B. Oxygen occurs very easily.

C. Nitrogen occurs very easily.

A. If the wheel temperature reaches as high as 177 deg., the core of safety plug shears off and the tire slips.

B. If the wheel temperature increases to more than 177 deg., the core of the fusible plug melts and the tire deflates.

C. The core of the filter element melts once the wheel temperature is above 177 deg., causing the tire to deflate.

A. 该扭力轴无法向内侧旋转，因此在拆下前，应先拆下外旋扭力轴。

B. 禁止将该扭力轴向内侧移动。因此，在拆下前，应先拆下外侧扭力轴。

C. 该扭力轴不能向内侧移动，因此在拆下之前，应先拆下外侧扭力轴。

A. The swivel nuts on both valves engage threads on an internal stem that loosens or draws tight the valve stem to a metal seat.

B. The rotating nuts on both valves are meshed with the threads on the inner valve stud, so that the valve stud is loosened or tightened to a metal valve base.

C. The swing nuts on both valves engage with the threads on the internal spool, allowing the spool to loosen or tighten to the metal seat.

A. 结果是，孔的直径达到了允许的最大值。

B. 结果是，允许孔的尺寸超出最大范围。

C. 结果是，孔的尺寸大于允许的最大尺寸。