多选题:在机电安装工程中,常用的钢制品管件主要包括(  )等。

题目内容:
在机电安装工程中,常用的钢制品管件主要包括(  )等。 A.弯头
B.法兰
C.盲板
D.闸阀
E.封头

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控制电缆线芯长期允许的工作温度为(  )℃。

控制电缆线芯长期允许的工作温度为(  )℃。A.65 B.70 C.75 D.80

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下列关于ABS工程塑料管的表述,错误的是(  )。

下列关于ABS工程塑料管的表述,错误的是(  )。A.使用温度为-20~70℃ B.压力等级分为B、C、D三级 C.耐腐蚀、耐温及耐冲击性能均优于聚氯乙烯管 D

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Large quantities of food and water, as well as a lot of bui

Large quantities of food and water, as well as a lot of building materials, ___

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