单项选择题
A.3kPa B.23.5kPa C.102.4kPa D.123.5kPa
A.雷诺准则 B.弗劳德准则 C.韦伯准则 D.马赫准则
A.1/10 B.1/3.16 C.1/316 D.1/31.6