题目内容

凡有防水要求的房间应有蓄水试验记录或()。

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变配电站应为电气作业人员提供()的绝缘用具及防护用具。

指点标发射机发射的是():

A. 某一点的向上垂直倒锥型的波束
B某一点向360度发射的波瓣
C. 某点发射倒8型的波瓣
D. 某一点向上发射的四个波瓣

Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because ()

A. oil foaming will occur
B. large quantities of oil are consumed
C. lube oil viscosity is always decreased
D. corrosive by-products are usually formed

粉煤灰砖(JC239-2001)标准规定的粉煤灰砖可用于工业与民用建筑的墙体和基础,但用于基础或用于易受冻融和干湿交替作用的建筑部位必须使用MU15及以上强度等级的砖。

A. 正确
B. 错误

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