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【单选题】
胆矾是一种蓝色晶体，化学式是CuSO 4 ·5H 2 O，胆矾受热时易失去结晶水，成为白色的无水CuSO 4 ，在工业上精炼铜、电镀铜等都要用到胆矾。上述对胆矾的描述中，没有涉及的是（ ）A.
物理性质
B.
制法
C.
用途
D.
化学性质
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【单选题】中国宪法经历了一个曲折而复杂的发展过程，下面关于中国宪法发展历史的描述，哪一项是错误的( )
A.
《中国人民政治协商会议共同纲领》是新中国的第一部宪法性文件．
B.
《约法》确认了大总统至高无上的权力
C.
《中华苏维埃共和国宪法大纲》是中国历史上第一部由人民代表机关正式通过并颁布实施的宪法性文件
D.
《钦定宪法大纲》是中国历史上第一个宪法性文件，对公民的权利毫无规定，《重大信条十九条》颁布于1911年辛亥革命之后，规定了公民的权利与自由
【单选题】Which of the following ratios has fallen as a result of Moore's Law?
A.
price/performance
B.
demand/supply
C.
profit/loss
D.
debt/equity
E.
price/earnings
【判断题】Surprisingly, Moore's law has held true since the early 1970s and will probably stand well into the 2020s.
A.
正确
B.
错误
【单选题】As a result of Moore's Law, ________.
A.
the risk of technology becoming obsolete has decreased
B.
the price to performance ratio of computers has fallen dramatically
C.
the cost of data processing has increased considerably
D.
nonroutine skills can be outsourced
【单选题】Which of the following is an accurate description of "Moore's Law"?
A.
The cost of microprocessor chips is halved about every eigh months.
B.
The amount of data that can be transmitted over an optical fiber cable doubles about every nine months.
C.
The number of transistors fitting on a chip doubles about every two years.
D.
The cost of a semiconductor fabrication plant doubles about every four years.
【单选题】Which of the following statements is true of Moore's Law?
A.
It is based on the technological advancements in weapon manufacturing.
B.
It made the cost of data processing, communications, and storage essentially zero.
C.
It states that the total number of transistors produced in the world doubles every 18 months
D.
It has resulted in obsoleting the use of transistors.
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