单项选择题
The（） only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.
A.central air condition system
B.high velocity system
C.low velocity system
D.single duct system
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相关考题
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单项选择题
The volute of centrifugal pump also acts as a diffuser converting （）into pressure head.
A.mechanical energy
B.heat energy
C.potential energy
D.kinetic head -
单项选择题
A centrifugal impeller consists of a number of vanes curving （） from the direction of rotation.
A.backwards
B.forwards
C.upward
D.downwards -
单项选择题
When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.
A.air chamber
B.head lank
C.primer
D.prime mover
