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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A.slide block
B.tilting box
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D.reaction ring -
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 -
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Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is （）.
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
