单项选择题
Brine density in a distilling plant is measured with a/an （）.
A.psychrometer
B.salinometer
C.anemometer
D.sphygmomanometer
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相关考题
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单项选择题
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 -
单项选择题
If you were operating a centrifugal water service pump with worn wearing rings, the （）.
A.pump would be very noisy
B.pump would vibrate excessively
C.pump would develop insufficient flow
D.stuffing box would leak excessively -
单项选择题
The packing installed in the pump stuffing box is lubricated by （）.
A.gravity and feed oil cups
B.grease cups
C.hand during installation
D.leakage through the stuffing box
