发布时间:2025-01-21 06:39:55
y有可能是室外雨水管。
d600是管径
0.002是坡度,千分之二
30是长度,30米。
管材不一定非要是砼管,这些个参数没表示材质。
求这种推拉窗的窗纱怎么开窗纱是上下式的想关上外面的窗户不知道怎么开
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