干密度ρd的定义式为( )。A.m/Vs B.ms/V C.ms/Vs

题库2022-08-02  28

问题 干密度ρd的定义式为(   )。A.m/VsB.ms/VC.ms/VsD.m/V

选项 A.m/Vs
B.ms/V
C.ms/Vs
D.m/V

答案 B

解析
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