题目内容

中国联通“沃•3G”是面向什么客户的品牌延展?()

A. 个人
B. 家庭
C. 集团
D. 服务

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已知铸坯断面为200mm×1000mm,求长5m的铸坯重量?(铸坯比重为7.8t/m3,计算结果保留两位小数点)

电动工器具的电气部分经维修后,应进行绝缘电阻测量及绝缘耐压试验,时间应维持()分钟。

A. 1
B. 2
C. 3
D. 4

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The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that()

A. one valve seats upwards, while the other seats downwards
B. the reed valves used on the discharge are made substantially thicker and heavier than the suction valves
C. the suction valve springs exert a greater tension than the discharge valve springs
D. the discharge valve springs exert a greater tension than the suction valve spring

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