Do not loosen the nut to align it.

A. 描述飞机螺旋桨时，可包括可变桨距螺旋桨的剖面图。

B. 描述飞机螺旋桨时，可包括变桨距螺旋桨的水平图。

C. 描述飞机螺旋桨时，可包括固定桨距螺旋桨的剖面图。

A. Release the hydraulic pressure in the accumulator.

B. Release the power pressure in the accumulator.

C. Release the hydraulic pressure in the actuator.

A. 将温度计调到摄氏温标。

B. 将温度计校准到华氏温标。

C. 调整摄氏温标的温度计。

A. A hydraulic pump operates the motor.

B. A fuel pump operates the motor.

C. A hydraulic motor operates the pump.

A. If as many as 50% of the holes are contaminated, you should clean the display units behinds the holes.

B. The holes on the bottom of the display unit should be cleaned once over 50% of them are clogged due to contamination.

C. If contamination causes a blockage of more than 50 percent of the holes, then clean the holes on the rear of the display units.

A. 根据FAR 43部的要求，持证飞行员可以拥有或驾驶载客飞机，并可以对其飞机实施限制范围内的预防维护。

B. 持有或驾驶航空器的持证飞行员由FAR 43部授权对其进行特定的预防维护。

C. 如果持证飞行员拥有或驾驶的飞机不用于航空承运目的，他可以按照FAR 43部授权，对飞机进行有限的预防性维护。

A. 噪音隔绝器通过产生废气来降低噪音。

B. 噪音吸收器通过排气来减小噪声。

C. 噪声抑制器降低废气产生的噪声。

A. If they fail, temporary damage can occur.

B. If they drop, permanent injury can occur.

C. If they fall, permanent damage can occur.

A. 如果无线电信号不清晰，调整频率。

B. 如果电子信号不清楚，调整波长。

C. 如果广播信号不清楚，测试频率。

A. If the scratch does not go through the protective layer, the unit is serviceable.

B. If the nick does not go through the primary surface, the unit is serviceable.

C. If the scratch does not go through the protective surface, the unit is movable.