发布时间:2025-02-01 01:27:15
水是形成水幕密封的关键之所在,水环式真空泵没有水形成水幕,就没有负压。由于摩擦产生很高的热量,损坏叶轮(转子),所以没有没有水循环是不行的。希望能帮到您!
请教各位大神二次结构中卫生间砖墙根部止水反梁的问题不是楼板四周翻边啊拜托了各位 谢谢
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