细沙过滤器中的石英砂怎么分层在纯化水设备中有个细沙过滤器,过滤器中的石英砂有粗和细的沙子,请问粗纱在上层还是在下层啊?理由是什么?谢谢你的答复!
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/26 23:43:45
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