单项选择题

A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.

A.high pressure liquid line
B.low pressure liquid line
C.high pressure vapor line
D.low pressure vapor line

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Compared to a constant pitch propeller, a controllable pitch propeller（）.

A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed

单项选择题

Compared to a constant pitch propeller, a controllable pitch propeller（）.

A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed

单项选择题

Which of the following statements describes the functions of a reservoir used in a hydraulic system?（）

A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above