题目内容

新经济时代管理思想的创新以知识的无限性和（）为指导思想。

A. 资源短缺性管理
B. 投资收益递减规律
C. 利润最大化
D. 投资收益递增规律

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Which of the listed statements is correct concerning the starting of centrifugal pumps?（）

A. They should always be started with the discharge valve closed
B. They should always be started with the discharge valve opened
C. A priming pump is always required to flood the impeller suction
D. They should always be started with the sealing line valves closed

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