Secondly, , check whether the drainage is smooth, there is no leakage and reflux and water phenomenon, high-grade water supplies with or without scratches.
其次，检查排水是否顺畅，有无渗漏及回流和积水现象，高档水件用品有无划痕。
Secondly, , check whether the drainage is smooth, there is no leakage and reflux and water phenomenon, high-grade water supplies with or without scratches.
其次，检查排水是否顺畅，有无渗漏及回流和积水现象，高档水件用品有无划痕。
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