单项选择题
A.进风侧B.上隅C.顶板D.回风侧
A.60%-70%B.65%-70%C.72%-80%D.72%-81%
A.0.1B.0.2C.0.3D.0.4
A.Φ159mmB.Φ60-108mmC.Φ13mmD.Φ32或38mm
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