请选择ABC8|,d,R:B'o在一个比例式中，两个比的比值都等于3，这个比例式可以是_________7F)L(M2F0y(v7Q-_(S
A.3∶1=1∶37F)L(M2F0y(v7Q-_(S
B.3∶1=0.3∶0.17F)L(M2F0y(v7Q-_(S
C.9∶3=3∶17F)L(M2F0y(v7Q-_(S