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
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相关考题
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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 -
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
