问题
单项选择题
管材内壁光滑，不会结垢，采用热熔连接方式进行连接，牢固不漏，施工便捷，绿色环保可用于冷热供水管的是()。
A.PVC-U管
B.PEX管
C.PVC-C管
D.PP-R管
答案
参考答案：D
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管材内壁光滑，不会结垢，采用热熔连接方式进行连接，牢固不漏，施工便捷，绿色环保可用于冷热供水管的是()。
A.PVC-U管
B.PEX管
C.PVC-C管
D.PP-R管
参考答案：D
| 完形填空。 |
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