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【多选题】
给水聚丙烯管道与金属管道、阀门及配水管件连接哪些要求( )
A.
应采用带件的聚丙烯过度管件
B.
该管件与聚丙烯管应采用热熔连接
C.
与金属管及配件应采用丝扣或法兰连接
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【单选题】听力原文：W：John，dinner is all ready and my parents have just arrived．Where are you? M：I'm sorry，Helen，but the meeting I'm attending won't be over for an hour．You should all go ahead and eat without me. Q：...
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