单项选择题
A.4mH2O B.6mH2O C.3.5mH2O D.2mH2O
A.5at B.0.5at C.98kPa D.40kPa
A.4.25Pa B.4.25kPa C.41.68Pa D.41.68kPa
A.相对压强 B.相对压强加当地大气压 C.绝对压强 D.绝对压强加当地大气压
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