芳香族化合物

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问题:

芳香族化合物

考点:化学工程香料学香料学题库
题型:名词解释

奥运赛场上处处体现了高科技的存在,北京有世界一流的兴奋剂检测中心.乙基雌烯醇是一种常见的兴奋剂,其化学式C20H32O.下列说法错误的是(  )

A.乙基雌烯醇由C、H、O三种元素组成

B.乙基雌烯醇中C、H、O三种元素原子个数比为20:32:1

C.乙基雌烯醇的相对分子质量为288

D.乙基雌烯醇中C、H、O三种元素的质量比为20:32:1

题型:名词解释

--I’m worried about tomorrow’s math exam.

-- ______ . I’m sure you will make it.

A.Bad luck

B.What a pity

C.Take it easy

D.Don’t mention it

题型:名词解释

么叫用水定额?

题型:名词解释

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (51) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (52) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (53) cards of all shapes and sizes. The (54) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (55) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (56) the familiar paper currency.

As the Net pushes the economy (57) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (58) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (59) This will definitely promote (60) and more efficient cooperation.

58().

A.invested 

B.comparing 

C.investing 

D.compared

题型:名词解释

古希腊的雅典首席 * * 伯里克利指出,“我们的制度之所以被称为民主政治,因为 * * 是在全体公民的手中”。当时,雅典事实上的国家最高权力机构是()

A.元老院

B.五百人会议

C.陪审法庭

D.公民大会

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