【多选题】【消耗次数：1】
矿尘浓度的表示方法有( )
①
A计数法
②
B质量法
③
C百分法
④
D平分法
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相关题目
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小儿烧伤双下肢包括臀部，用九分法计算面积应为（ ）
①
2×9%+1%+（12-年龄）
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