冰海沉船 （财经词语）


谜底：经济危机

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在光的作用下,O2可转变为O3,当1molO3生成时,吸收了3.01×个光子,则按产物计算该反应的量子效率Φ为(         )
A、1
B、1.5
C、2
D、3

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园林产品经过分解后都具有许多共同的特征（）
A、正确
B、错误

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的希尔伯特变换是             。
A、
B、
C、
D、

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综合门市部不清静 （打一字）

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根据企业所得税法律制度的规定，下列各项中，不属于企业所得税纳税人的是（ ）。
A、外商独资企业
B、一人有限责任公司
C、个人独资企业
D、社会团体

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天麻的功效为[填空(1)] ，[填空(2)] ，[填空(3)] 

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钢筋混凝土预制桩预制时堆放层数不宜超过（ ）层。

A．2
B．3
C．4
D．5

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走麦城 （打字一）

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在一定温度下，直流电阻为零是判断超导体的唯一标准。
A、正确
B、错误

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   Plastics are materials which are softened by heat and set into lasting form when shaped in a mold. Some are natural; some are semi-synthetic, the result of chemical action on a natural substance; some are synthetic, built up from the constituents of oil or coal. All are based on the chemistry of carbon, with its capacity for forming chains. The molecules that compose them (monomers) link together in the setting or curing(固化) process to form chains (polymers), which give plastics their flexible strength. Some plastics retain their ability to be softened and reshaped; like wax, they are thermoplastic. Others set permanently in the shapes they are given by heat and pressure; like eggs, they are thermosetting.     From industrial beginnings in the nineteenth century, plastics have struggled through a hundred and twenty years of glory, failure, disrepute(坏名声) and suspicion on the slow road to public acceptance. Now, at last, one can positively say that plastics are appreciated and enjoyed for what they are; that they make modern life richer, more comfortable and convenient and also more funny. Plastics are warm materials, sympathetic to the human touch, and their transformation into things that come into contact with human beings is entirely appropriate.     The fact that there are plastic antiques comes as a shock to most people. How can a material that seems so essential in the twentieth century, and one that is so much associated with cheap, disposable products, have a history at all? It is a young technology, and a great part of the fun of collecting plastics is that beautiful pieces of historical interest can still be found very cheaply.  A.
Make posters. B.
Write a speech. C.
Answer questions. D.
Review the man’s talk.

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