Obey the safety precautions when you do work with high voltages.

A. 拆除所有阻止操纵舵面自由移动的校装销和设备。

B. 拆下所有的插钉和设备使操纵舵面自由移动。

C. 拆下所有的开口销，并移走防止操纵舵面自由移动的设备。

A. 告诉一个人撤除轮挡。

B. 告诉A撤除轮挡。

C. 告诉一个人去拆卸机轮。

A. Take the oxygen mask in a hurry to start the flow of oxygen.

B. Pull the oxygen mask with a sudden movement to start the flow of oxygen.

C. Pull the oxygen mask in a must to start the flow of oxygen.

A. Examine and remove the parts that are damaged.

B. Examine the removed parts with damage.

C. Examine the removed parts for damage.

A. 更换滑阀，确保其表面光滑。

B. 如果滑阀表面粗糙，则将其更换。

C. 如果活门表面粗糙，则更换其滑动桶。

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. To gain entry to the nearby structure, take out the sensor.

B. Remove the sensor to get access to the adjacent structure.

C. Disassemble the sensor to get access to the adjacent structure.

A. 垂直安定面上翼肋改装

B. 垂直安定面翼尖翼梁改装

C. 垂直安定面翼尖缘条改装

A. A small child should sit in an unlimited seat.

B. A small child needs to sit in a seat with safety device.

C. A small child could sit in an adult seat.

A. 一定不要有漏洞。

B. 确保没有遗漏。

C. 确保没有泄漏。