题目内容（请给出正确答案）

[单选题]

The 10-mm Dorr-Oliver cyclone separates the oversize dust from the respirable fraction （usually considered to have an aerodynamic diameter of （)or less).

A.10μm

B.10pm

C.15 pm

D.20 pm

提问人：网友MiniJp 发布时间：2022-01-07

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· 有4位网友选择 C，占比44.44%
· 有3位网友选择 B，占比33.33%
· 有2位网友选择 A，占比22.22%

ABCD

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