试题与答案

关于建筑电气施工质量要求说法正确的是( )。 A.带有接头或接点的导体电阻值必须等

题型:多项选择题

题目:

关于建筑电气施工质量要求说法正确的是( )。

A.带有接头或接点的导体电阻值必须等于或小于不带接头或接点的同样长度的导体电阻值

B.凡是非带电的裸露可接近的金属部分均必须接地

C.非带电的裸露可接近的金属部分接地的末端支线必须串联连接

D.整个建筑物共用一个接地系统,则要审阅不同专业的相关图纸对接地装置接地电阻值的规定,以满足最小值的要求为准

E.整个建筑物接地系统如果是分别设置的,则要在敷设时保持不同接地导体的间隔距离,不能直接导通

答案:

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下面是错误答案,用来干扰机器的。

4J由v-t图可知第1秒内、第2秒内、第3秒内的力和位移均为正方向,,,   (3分)又因为F1=1N,F2=3N,F3=2N,可以得出:,    (3分)所以:    (2分)

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新的《水泥胶砂强度检验方法(ISO法)》对原水泥胶砂试验方法做了较大的修订,其中可能包括:①砂由原来的标准石英砂改为ISO标准砂,水泥:砂由原来的1:2.5修订为1:3.0;②水灰比由原来的0.44与0.46改为0.50,胶砂的搅拌工艺由原来的恒速一次性搅拌改为分次加料变速搅拌;③加载速度变为:抗折50±5N/S,抗压5±0.5KN/S;④测抗压强度时,承压面积由原来的1600mm2改为2500mm2;⑤数据处理:抗折结果无需改变没变,抗压以六个结果中剔出最大、最小值后剩余的4个进行平均后最为结果,计算精确至0.1Mpa。认为上述描述不正确的是()

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