4.5.4 將比重瓶中的液體倒出約一半,稱量此時液體和比重瓶的質(zhì)量,計為式中的m2;在比重瓶中裝入經(jīng)4.4處理后的粉塵試樣約3~5g,稱量此時液體、粉塵和比重瓶的質(zhì)量,計為式中的m3,并靜止存放30min以上。
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