发布时间:2025-01-23 17:52:20
套塑料管定额 例:塑料管(UPVC、PVC、PP-C等);热水,PPR;De20;热熔 工作内容:;给水管道消毒、冲洗 管道、管件及弯管的制作安装
空调制冷中cop和eer分别表示什么那个是制冷量那个是制热量
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