单项选择题
A pump is said to have "negative suction head" when the pump is located （）.
A.between the suction and discharge
B.below the liquid supply
C.above the liquid supply
D.any of the above
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相关考题
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单项选择题
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （） (1) reciprocating (2) vane (3) gear
A.（1）only
B.（1）and（2）
C.（1），（2）and（3）
D.（2）and（3） -
单项选择题
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （） (1) reciprocating (2) rotary (3) centrifugal
A.（1）only
B.（1）and（2）
C.（1），（2）and（3）
D.（2）and（3） -
单项选择题
A positive displacement pump is that where the volume of the pump chamber is alternately （） to draw the liquid in and then （） to force the liquid out.
A.increased；decreased
B.decreased；increased
C.decreased；decreased
D.increased；increased
