9. X,Y,R,S 四个正整数,R<S, Xr=Ys i. X is a multiple of Y ii. Y is a multiple of X iii. S is a multiple of R A. Only i B. Only ii C. Only iii D. ii & iii E. i & ii 后两项有点儿记不清了,但是总之没有I & iii的,作者选的A
9. X,Y,R,S 四个正整数,R<S, Xr=Ys i. X is a multiple of Y ii. Y is a multiple of X iii. S is a multiple of R A. Only i B. Only ii C. Only iii D. ii & iii E. i & ii 后两项有点儿记不清了,但是总之没有I & iii的,作者选的A