A.用清晰線條對應(yīng)的較小鐘點乘以60 B.用清晰線條對應(yīng)的較小鐘點乘以30 C.用清晰線條對應(yīng)的較大鐘點乘以60 D.用清晰線條對應(yīng)的較大鐘點乘以30
A.30 B.45 C.60 D.75
A.0.2 B.0.3 C.0.5 D.0.6