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單項(xiàng)選擇題

Thermostatic expansion valve are （）.

A.either all the way open or all the way closed
B.normally open
C.throttled depending on load
D.controlled by suction pressure

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單項(xiàng)選擇題

When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）
(1) the rotor
(2) the internal surface of the housing
(3) the external surface of the housing

A.(1) only
B.(2) only
C.(1) and (2)
D.(1), (2) and (3)

單項(xiàng)選擇題

Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）

A.Control of evaporation
B.A separate means to prevent feed-water contamination
C.Power circulating pump
D.Super-heater

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