单项选择题
A.1m B.1.5m C.2m D.3m
A.1.5m B.1.2m C.1m D.0.8m
A.3m B.4m C.5m D.6m
A.0.05~0.1MPa B.0.1~0.3MPa C.0.3~0.5MPa D.0.5~0.8MPa
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