发布时间:2025-02-07 20:11:12
管道和水龙头连接处一圈圈缠起来的,亚黄色的麻绳制品。这就是丝堵,用途是防止漏水,紧固管道连接,一般用于DN较小的管道。价钱很便宜。
请问哪里有卖那种可以把衣服里面的空气抽成真空的方便装进行李的东西
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