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chemical engineering fluid mechanics
1. The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.
(A): inlet tip of a blade curves in a direction opposite to that
(B): inlet tip of a blade is towards the direction
(C): outlet tip of a blade curves in a direction opposite to that
(D): outlet tip of a blade is towards the direction
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