选矿的方法主要有两种：重力选矿法和浮选法。
参考答案：错
如果一国提高利率，那么会出现（）。
—Would you like to see the film Rush Hour (《尖峰时刻》) with me?
—_____[ ]
A. Yes, please.
B. That's a good idea.
C. You're welcome.
D. That's OK.
