( )指交易双方直接成为交易对手的交易方式。
A．场内交易B．柜台交易C．交易所交易D．远期交易
参考答案：B
根据情景完成对话。
A:What 1 you like, Jim?
B:Well,I 2 apples. But I 3 like oranges.
A:And your friend? What 4 he like?
B:He 5 pears and bananas, but he 6 like French fries. 7 do you like?
A:I like hamburgers 8ice cream.I often 9 tomatoes.I also 10 strawberries.
某筛分机的30吨给矿中，小于筛孔尺寸的含量为40%，而筛下实际得8吨，计长时期筛分效率？
