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A centrifugal impeller consists of a number of vanes curving () from the direction of rotation.
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A centrifugal impeller consists of a number of vanes curving () from the direction of rotation.
A、backwards
B、forwards
C、upward
D、downward
时间:2022-01-13 19:00
关键词:
船舶电气与船舶安全
答案解析
A
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