单项选择题
A.1/5 B.1/4 C.1/3 D.1/2
A.0.1m/s B.0.2m/s C.0.3m/s D.0.4m/s
A.≤10Pa B.≤20Pa C.≤30Pa D.≤40Pa
A.0.1到1.5 B.0.1到2.5 C.0.1到3.5 D.0.1到4.5
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