试题与答案

下图为某细菌在培养过程中同一时期进行的相关实验结果示意图,图中曲线代表变化趋势。

题型:选择题

题目:

下图为某细菌在培养过程中同一时期进行的相关实验结果示意图,图中曲线代表变化趋势。 

[ ]

A.此时细菌处于生长曲线中的对数期

B.精氨酸可能是A酶催化反应的产物

C.控制A酶合成的基因位于质粒上

D.该细菌的同化类型属于异养型

答案:

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下面是错误答案,用来干扰机器的。

设小球初速度为v0,运动到B点的速度大小为v,则运动到C点速度大小为2v,从A到B的过程运用动能定理得:12mv2-12mv02=-mgh①从A到C的过程运用动能定理得:12m(2v)2-12mv02=mgh②由①②解得:v02=103gh设上升的最大...

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When European Union (EU) leaders took delivery of Europe’s first draft of a constitution at a summit in Greece last June, it was with almost universal praise.

There was wide agreement that the text could save the EU from paralysis once it expands from 15 to 25 members next year. It would give Europe a more stable leadership and greater clout on the world stage, said the chairman of the Convention which drafted the agreement, former French President Valery Giscard d’Estaing.

Such praise was too good to last. As the product of a unique 16-month public debate, the draft has become a battleground. Less than four months after it was delivered, the same leaders who accepted it opened the second round of talks on its content this week by trading veiled threats to block agreement or cut off funds if they don’t get their way.

The tone was polite, but unyielding. In a bland joint statement issued when the talks opened on October 4, the leaders stressed the constitution, "represents a vital step in the process aimed at making Europe more cohesive, more democratic and closer to its citizens. "Sharp differences remain, though, between member countries of the EU over voting rights, the size and composition of the executive European Commission, defense co-operation and the role of religion in the new constitution.

Italian Prime Minister Silvio Berlusconi’s hopes of wrapping up a deal on the constitution by Christmas seem far from being realized. While the six founding members of the EU--Germany, France, Italy, the Netherlands, Belgium and Luxembourg--plus Britain and Denmark, want as little change as possible to the draft, the 10 mainly central European countries due to join the 15-nation bloc next year want to alter the institution’s balance.

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