單項(xiàng)選擇題A centrifugal impeller consists of a number of vanes curving （） from the direction of rotation.
A.backwards
B.forwards
C.upward
D.downwards
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1.單項(xiàng)選擇題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
2.單項(xiàng)選擇題Water enters the rotating impeller through the entry, known as “（）”, at the centre.
A.eye
B.hole
C.balance holes
D.opening
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