某产品是相对市场占有率高,但销售增长率较低的大“奶牛”类产品,对于此类产品,最适宜采取的投入策略是()。
A.发展
B.保持
C.收割
D.放弃
参考答案:B
Chengdu is a city _______ you hate to say goodbye once you have visited it.[ ]
A. in which
B. at which
C. to which
D. with which
淮南师范学院副院长是()、()、()。