单选题：有伴热管的管道保温层施工时，伴热管应按规定固定，伴热管与主管线之间应保持（　　），不得填塞保温材料。

题目内容：
有伴热管的管道保温层施工时，伴热管应按规定固定，伴热管与主管线之间应保持（　　），不得填塞保温材料。 A．接触
B．贴紧
C．空隙
D．一定角度

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答案解析：

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