具体来说，摩尔定律就是每（）个月，产品的性能将提高一倍。
A.16
B.12
C.6
D.18
参考答案：D
---How much does this store often _______ for such large eggs ?
--- Only $ 65 US cents a dozen . It was a real bargain.
A．demand
B．cost
C．pay
D．charge
一段炉入口工艺混合气增加100℃时，可将炉管壁温下降（）℃。
A.20
B.10
C.16
D.25
