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注:北方地区可根据当地防冻层深度增加地下埋管。
PS: Underground burying tube should be increased depending on local depth of anti-frozen in north area.
youdao
-
注:北方地区可根据当地防冻层深度增加地下埋管。
PS: Underground burying tube should be increased depending on local depth of anti-frozen in north area.
youdao