单项选择题
Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）
A.The follow-up gear
B.The rudder angle indicator
C.The synchronous electric transmitter
D.A rudder angle limit switch
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Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.
A.apparent slip
B.tree slip
C.pitch
D.propulsive efficiency -
单项选择题
A multistage centrifugal pump can be BEST described as having （）.
A.two or more impellers housed together in one casing and mounted on a single shaft
B.a single stepped impeller mounted in a progressively staged casing
C.a large radial clearance between the impeller and casing to prevent overheating due to
D.an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages -
单项选择题
If a refrigeration system compressor crankcase is sweating, you should （）.
A.add refrigerant to the system
B.adjust the thermal expansion valve to the proper setting
C.adjust the float valve to the proper holding pressure
D.open the hand expansion valve
