单项选择题
A.5m B.10m C.15m D.30m
A.10m B.15m C.20m D.30m
A.气管Φ12.70mm与液管Φ6.35mm B.气管Φ15.88mm与液管Φ6.35mm C.气管Φ15.88mm与液管Φ9.52mm
A.压力值正常 B.压力值偏低 C.压力值呈负压
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