单项选择题

Tube leaks in the distillate cooler of a two stage flash evaporator will result in （）.

A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser

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The pressure of a liquid leaving the pump can be referred to as the （）.

A.total head
B.discharge head
C.net positive suction head
D.suction head

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The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.

A.slide block
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单项选择题

Which of the following statements describes the relationship between viscosity and specific gravity?（）

A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other