单选题:微粒有效径是指

题目内容:
微粒有效径是指 A.与被测粒子具有相同沉降速度的球形粒子直径
B.与被测粒子具有相同沉降速度的球形粒子半径
C.与被测粒子具有相同大小的粒子
D.与被测粒子具有相同性质的粒子
E.以上说法都不对

参考答案:
答案解析:

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