单项选择题
A.Z=p/π=d/m B.Z=p/π=m/d C.m=p/π=d/Z D.m=d/π=Z/p
A.Z=12 B.Z=14 C.Z=17 D.Z=20
A.1/10 B.1/20 C.1/30 D.1/50
A.1/100 B.1/50 C.1/30 D.1/20
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