4分水管6分水管直径是几厘米?或是几寸?

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4分水管6分水管直径是几厘米?或是几寸?
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4分水管6分水管直径是几厘米?或是几寸?
4分水管6分水管直径是几厘米?或是几寸?

4分水管6分水管直径是几厘米?或是几寸?
4分水管直径15,6分水管直径20或19都对

4分是15MM
6分是20MM
2寸是50MM