催化剂的定义是什么?

题型:问答题 简答题

问题:

催化剂的定义是什么?

考点:化学分析工考试初级化学分析工初级化学分析工题库
题型:问答题 简答题

Meta分析在合并各个独立研究结果前应进行()。

A.相关性检验

B.异质性检验

C.回归分析

D.图示研究

E.标准化

题型:问答题 简答题
阅读下面短文,掌握其大意.然后从1—15各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。
A land free from destruction(毁灭,破坏), plus wealth, natural resources, and labor supply ——  all these were important 1      in helping England to become the center for the Industrial Revolution. 2       they were not enough. Something else was needed to start the industrial process. That "something special" was men —— 3      individuals who could invent machines, find new 4      of power, and establish business organizations to reshape society. The men who created the machines of the Industrial Revolution 5     from many backgrounds and many occupations. Many of them were 6       inventors than scientists. A man who is a pure scientist is primarily interested in doing his research 7       .He is not necessarily working 8      that his findings can be used. An inventor or one interested in applied science is all trying to make something that has a concrete use. He may try to solve a problem by 9       the theories 10       science or by experimenting through trial and error. Regardless of his method, he is working to obtain a  11      result: the construction of a harvesting machine, the burning of a light bulb(灯泡), or one of 12      other objectives. Most of the people who 13       the machines of the Industrial Revolution were inventors, not trained scientists. A few were both scientists and inventors. Even those who had little or no training in science might not have made their inventions 14      a groundwork had not been laid by scientists years 15     .
小题1:
A.cases B.reasons C.factors D.situations
小题2:
A.But B.And C.Besides D.Even
小题3:
A.generating B.effective C.motivating D.creative
小题4:
A.origins B.sources C.bases D.discoveries
小题5:
A.came B.arrived C.stemmed D.appeared
小题6:
A.less B.better C.more D.worse
小题7:
A.happily B.occasionally C.reluctantly D.accurately
小题8:
A.now B.and C.all D.so
小题9:
A.planning B.using C.idea D.means
小题10:
A.of B.with C.to D.as
小题11:
A.single B.sole C.specialized D.specific
小题12:
A.few B.those C.many D.all
小题13:
A.proposed B.developed C.supplied D.offered
小题14:
A.as B.if C.because D.while
小题15:
A.ago B.past C.ahead D.before
题型:问答题 简答题

根据给定资料,从“权力、责任与道义、良知”的角度,写一篇议论文。要求:自拟标题,联系实际,观点明确,内容充实,语言流畅,层次清楚,有说服力;全文不少于1000字。

题型:问答题 简答题

下列选项中,脑膜瘤的典型CT表现是()

A.钙化、囊变坏死

B.骨质破坏

C.明显瘤周水肿

D.占位效应明显

E.多为等密度,明显均匀增强

题型:问答题 简答题

与国民经济发展和人民生活关系重大的极少数商品价格可以实行()。

A、政府指导价或政府定价

B、地方指导价

C、地方定价

D、价格浮动

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