高铜银合金粉的铜含量（） A. B.>6% C.>10% D.>30%

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问题单项选择题 A1/A2型题

高铜银合金粉的铜含量（）

A.<3%

B.>6%

C.>10%

D.>30%

答案

参考答案：B

填空题

写出一个系数是2，且含有字母a，b的3次单项式（）（答案不唯一）．

选择题

-Though radio and television are ____ popular in the world today, I think the TV is ____ useful.

--Of course, on TV we can see and hear what is going on home and abroad.

A．more, less

B．very, more

C．more, more

D．very, less