问题
单项选择题
振动落砂机按振动方式不同，可分成气动、机械和电磁振动三种，其中（）已很少采用。
A.气动落砂机
B.机械振动落砂机
C.电磁振动落砂机
D.机械振动和电磁振动落砂机
答案
参考答案：A
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振动落砂机按振动方式不同，可分成气动、机械和电磁振动三种，其中（）已很少采用。
A.气动落砂机
B.机械振动落砂机
C.电磁振动落砂机
D.机械振动和电磁振动落砂机
参考答案：A
Passage 3
Which of the following is not true about the Nokia-Yahoo deal a. It covers the mid-priced cell phone. b. It is dominated by high-priced cell phone. c. Some Nokia models have been available in the market in different areas. d. The deal was first announced in January.