23.Bleed the system before you disconnect the components.

A. Do not lift the aircraft on jacks if the wind speed is more than 20 MPH.

B. Do not hoist the aircraft on chocks if the wind speed is more than 20 MPH.

C. Do not raise the aircraft on jacks if the win

D. speed

A. 用刀片画一条线。

B. 在刀刃上画一行。

C. 在叶片上画一条线。

A. 描述飞机螺旋桨时,如果合适,应阐述正桨、反桨和反转。

B. 描述飞机螺旋桨时,如适用,应描述顺桨、解除顺桨和反桨相关信息。

C. 描述飞机螺旋桨时,如果合适,应讨论顺桨、不反桨和反推。

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. IAS shall be monitored continuously until the end of the test.

B. Monitor the speed indication as long as the test continues.

C. Monitor the speed indication continuously until the end of the test.

A. The air conditioning system keeps the air in the pressurized fuselage compartments at the correct pressure,temperature and freshness.

B. The air conditioning system keeps the air in the pressurizing cabin of the fuselage at the correct pressure,temperature and freshness.

C. The air conditioning system keeps the air in the pressurized cabin of the fuselage at the correct pressurization,temperature and freshness.

A. All publications shall use the standard numbering system.

B. All documents and materials shall use the standardized numbering index system.

C. All publications shall use the standard numbering system for indexing.

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. 如果没有按时处理这种故障指示,会因此严重事故。

B. 若不及时解决这种事故症候,势必引起严重事故。

C. 这类事故处理指南, 如果当时未遵守执行, 会引起严重后果。

A. A system consists of related components used to perform a specific function.

B. A system is a combination of interrelated components arranged to perform a specific function.

C. A system is combined with relevant components that perform a specific function.