发布时间:2025-01-17 01:17:44
当然有冷热之分啦,总体上看PPR材料的耐受温度是65度。冷热水管的区别主要在耐受压力的方面;冷水管的耐受压力是1.25或1.6兆帕,热水管的耐受压力是2.0或2.5兆帕。冷水管与热水管耐受压力不同,壁厚不同,价格也不同,热水管要比冷水管的管壁厚,价钱要贵。热水管上标识有红线,目前市场的口碑比较好的是:金德,伟星,天力,万能,上丰,天力,万能属于冷热管和一的.希望能解决你的疑惑。
用一个开关同时控制两个电灯应怎样连接电路先连实物图后画电路图如图所示
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