单项选择题
A.25KPa B.30kpa C.35kpa D.40kpa
A.20.0 B.60.0 C.65.0 D.70.0
A.3.0 B.4.0 C.5.0 D.6.0
A.20~100HZ B.30~60HZ C.100~200HZ D.150~240HZ
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