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

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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

單項(xiàng)選擇題

Which of the following statements is correct regarding an oil with a high viscosity index?（）

A.A large change of viscosity occurs with a minor change in temperature
B.No change in viscosity occurs with any change in temperature
C.Very little change in viscosity occurs with a significant change in temperature
D.The viscosity of the oil increases with an increase in temperature

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One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.

你可能感興趣的試題

Brine density in a distilling plant is measured with a/an （）.

Which of the following statements is correct regarding an oil with a high viscosity index?（）