发布时间:2025-02-01 01:20:14
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!
客厅5米5米的要做成斜坡请问中间要不要加横梁若果不加梁刚筋怎么
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