单选题：热力管道严密性试验一级管网稳压（　　）min内压力降不大于0．05MPa；二级管网稳压30min内压力降不大于（　　）M

题目内容：

热力管道严密性试验一级管网稳压（　　）min内压力降不大于0．05MPa；二级管网稳压30min内压力降不大于（　　）MPa为合格。 A．60；0．03
B．45；0．05
C．60；0．05
D．45；0．03

参考答案：

答案解析：

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