一头小牛重200千克,5头同样重的牛共重( )吨。
1
We are proud of _____ in Shengli High School.
A. study B. studying C. to study
每种估价方法都有其特定的适用对象和条件,有时可以同时运用,以相互验证;有时是相互补充,但不应相互替代。()