里面有瓣膜结构。关闭节阀,就能把墙里管子余水放出来
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可是旧的那种从你的图里看同样位置也有个东东在那里,怎么才能知道是新的还是旧的?
-cdrw-
♂
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12/03/2015 postreply
07:57:00
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谢谢指出问题。
-又当爹来又当妈-
♀
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12/03/2015 postreply
08:04:48
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