题目内容

自动过分相有哪几种形式,各有何优缺点?

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起锯时施加压力要重。()

A. 正确
B. 错误

A casualty report of an intentional grounding of a ship is required under what condition?()

A. Under any condition
B. If the grounding lasts over 24 hours
C. If it creates a hazard to the environment
D. At the owner's discretio

()是指提供不同产品以满足同一种需求的竞争者。

漏电保护器,应每月检查一次,即操作(),检查其是否能正常断开电源。

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