下面四个等式中表示x和y成正比例关系的是请选择DCBA/m5I2?5W6B。(t7|;a8Q7S(H,_
A.xy=6(t7|;a8Q7S(H,_
B. =y(t7|;a8Q7S(H,_
C.6x=y(t7|;a8Q7S(H,_
D.6x=(t7|;a8Q7S(H,_