If there is no contamination, start the operation again.

A. 在移动控制杆（器）前，检查锁定状态。

B. 请在完成解锁前移动控制杆（器）。

C. 移动控制杆（器）之前先解锁。

A. When there are too many positive or subtractive pressure in the fuel tanks,the pressure relief valve eliminates damage to the wing structure.

B. When there is too much plus or minus pressure in the fuel tanks,the pressure relief valve previews damage to the wing structure.

C. The pressure relief valve prevents damage to the wing structure when there is too much positive or negative pressure in the fuel tanks.

A. 向前旋转手柄。

B. 向后移动水平面。

C. 向后移动手柄。

A. If there is no approval of the FAA Oversight Office that manages the airplane model Type Certificate, anyone cannot change or delete these inspection features that are compulsive.

B. These inspection features can be changed or deleted if they don＇t get approval of the FAA Oversight Office that is responsible for the airplane model Type Certificate because they are mandatory.

C. If changing or deleting of these inspection features is approved by the FAA Oversight Office that manages the airplane model Type Certificate, they are mandatory.

A. The gyroscope will become stable before less than 15 seconds.

B. The gyroscope will become stable for at least 15 seconds.

C. After about 15 seconds, the gyroscope will become stable.

A. 副翼回到中立位后，确保它们与襟翼齐平。

B. 副翼回到初始位后，确保它们与缝翼垂直。

C. 襟翼移动到中立位后，确保它们与缝翼齐平。

A. Use the upper latch mechanism to lock the lower display unit in the middle.

B. The latch mechanism at the top is used to secure the center display unit on the bottom.

C. The center lower display unit is installed with the latch mechanism at the top.

A. 描述飞机发动机时，应说明新发动机和拆装后发动机的正确维修操作方法。

B. 描述飞机发动机时，应说明新发动机和损坏后发动机的正确操作和保养。

C. 描述飞机发动机时，应说明全新发动机和磨合期后发动机的正确操作和保养。

A. 在远离设备或金属框架建筑物的区域进行工作。

B. 在有设备或材料框架建筑物的区域进行工作。

C. 在远离设备或材料成型建筑物的区域进行工作。

A. The aircrft is taxiing to China on the runway.

B. The aircrft is running to China on the ramp.

C. A Chinese aircrft is taxiing on the runway.