單項(xiàng)選擇題For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is （）.
A.100℃
B.125℃
C.150℃
D.175℃
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1.單項(xiàng)選擇題One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
A.maintain radial alignment between the pump impeller and casing
B.absorb all impeller shaft end thrust
C.prevent water leakage to the atmosphere
D.prevent wear of the pump casing and/or impeller
2.單項(xiàng)選擇題Brine density in a distilling plant is measured with a/an （）.
A.psychrometer
B.salinometer
C.anemometer
D.sphygmomanometer
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