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问题 选择题

下列关于金属冶炼的说法中，不正确的是

A．热分解法适用于制备不活泼金属   

B．热还原法的常用还原剂为C、CO、Al、H2等

C．熔融电解法适用于制备不活泼金属

D．水溶液中的置换法适用于用较活泼金属制取较不活泼金属

答案

答案：C

单项选择题

The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.

A．full

B．lost

C．inundated

D．filled
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多项选择题

在选择仪表电缆的桥架时一般要考虑（）因素。

A、桥架宽度

B、电缆的长度

C、可靠接地

D、电缆桥架的支撑距离
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