单项选择题
A.50m B.100m C.150m D.200m
A.15S B.30S C.100S D.60S
A.1Mpa B.0.1Mpa C.0.4Mpa D.4Mpa
A.自吸泵 B.离心泵 C.齿轮泵 D.喷射泵
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