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问题 单项选择题

在黑色金属中（）不能锻造。

A、中碳钢

B、高碳钢

C、铸铁

D、钢铁

答案

参考答案：C

选择题
According to the companies' websites, the number of active QQ users in China has reached 1 billion, while Qihoo 360 also claims ______ at least 300 million users before June 2010.

A. to have
B. to have had
C. having
D. having had
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单项选择题

战略与战术的区别表现在，战略针对的是（）

A.整体性、长期性、方向性

B.局部性、短期性、具体性

C.整体性、长期性、具体性

D.局部性、短期性、方向性
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