Remove oil and grease with a degreasing agent.

A. 描述飞机燃油系统时，应说明交替供油和燃油运输（如适用）。

B. 描述飞机燃油系统时，应提供交输供油和燃油传输（如适用）相关描述。

C. 描述飞机燃油系统时，应说明交叉供油和燃油传递（如适用）。

A. Make sure that the pressure in the cabin is almost zero.

B. Verify that the cabin pressure is not above zero.

C. Ensure that the pressure in the cabin is completely zero.

A. Horsepower Radius and Engine Revolving Speed

B. Horsepower Ratings and Propeller Rotational Speed

C. Horsepower Values and Propeller Turning Speed

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. 将备件送到修理厂。

B. 将零件送至大修商店。

C. 将部件送到大修车间。

A. 去除腐蚀以及表6001中提及的化学污染。

B. 用表6001中规定的化学剂去除腐蚀。

C. 清除表6001中提及的化学脱胶情况。

A. There are trim tabs at the rear of both ailerons.

B. There are trim tabs at the rear of both flaps.

C. There are trimmable stabilizers at the rear of both elevators.

A. The Index Numbering System is described in the following paragraph.

B. The Index Numbering System is introduced in the next paragraph.

C. The Index Numbering System is compared in the later paragraph.

A. 系统中的流应该以不同图案的底纹展现，其线条应尽少拐弯。

B. 系统的箭头应该用具有最小变换的线路样式来标记。

C. 用最少弯折的管路在固定模式下的阴影部分展示系统的流通。

A. If the tire temperature is unusually high, open the valve.

B. If the tyre pressure is insufficiently high, open the valve.

C. If the tire pressure is unusually high, open the valve.