题目:
将城市工程管线按弯曲程度分类,下列哪一组管线属于可弯曲管线( )
①自来水管道;②污水管道;③电信电缆;④电力电缆;⑤电信管道;⑥热力管道
A.③④⑤
B.①②③
C.③④⑥
D.①③④
答案:
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