题目内容

田鼠爱上了拇指姑娘。()

A. 正确
B. 错误

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Which of the following statements represents the main difference between a relay and a contactor?()

A. Contactors control current and relays control voltage
B. A relay is series connected and a contactor is parallel connected
Contactors can handle heavier loads than relays
D. Contactors are made from silver and relays are made from copper

成品烧结矿的最终矿物组成,在燃料用量一定的条件下,仅仅取决于烧结料的()。

从全部总体单位中按照随机原则抽取部分单位组成样本,只可能组成一个样本。()

A. 正确
B. 错误

国家开发银行已在世界()多个国家设立了工作组,为各类投资项目提供信息咨询。

A. 20
B. 40
C. 50
D. 80

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