3:8的前项加上3,要使比值不变,比的后项应加上请选择ABC9z:b5C5I4j)H/^/W-R'Q'A8V6\1O-W2W/|,T8E)D
A.3'Q'A8V6\1O-W2W/|,T8E)D
B.8'Q'A8V6\1O-W2W/|,T8E)D
C.6'Q'A8V6\1O-W2W/|,T8E)D