单项选择题

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
B.tilting box
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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
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A.stored at temperatures below 60 degrees Fahrenheit
B.charged into a system having copper fittings
C.allowed to mix with compressor oil
D.exposed to an open flame or hot surface