干线采暖管道应采用无缝钢管。_爱下问搜题

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问题判断题

干线采暖管道应采用无缝钢管。

答案

参考答案：对

选择题

Someone is knocking at the door. Go and see _____.

A. who is he
B. who he is
C. who is it
D. who it is

填空题

空调机冷凝器太脏，制冷系统中将出现（）和压缩机超载。