发布时间:2025-01-23 04:10:40
防水混凝土我们这边叫抗渗混凝土.以P6.P8最多.P10的很少了.抗渗混凝土要报检的.龄期为28天-90天送检规范是500方一组.也有的地区是250-500方为两组.
dvd放入碟子后在电视上却没有画面请问是电视机的原因还是dvd的原因
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