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【单选题】

Why are removable sleeves installed on centrifugal pump shafts?()

A、They make it easier to replace the pump shaft packing

B、They can be economically replaced as they wear out

C、They can be removed when it is necessary to lighten the weight of the pump

D、They increase the strength of the shaft

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第2题

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第5题

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第8题

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第9题

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