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问题 选择题

下列关于反应速率的说法中，错误的是[ ]

A．反应速率用于衡量化学反应的快慢

B．决定反应速率的主要因素是反应物的性质

C．可逆反应达到化学平衡时，正、逆反应速率都为0

D．增大反应物浓度，提高反应物温度都能增大反应速率

答案

答案：C

填空题

某工程由A，B，C，D四道工序组成，完成它们需用时间依次为2，5，x，4天．四道工序的先后顺序及相互关系是：A，B可以同时开工；A完成后，C可以开工；B，C完成后，D可以开工．若该工程总时数为9天，则完成工序C需要的天数x最大是______．
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单项选择题

While most recent attention in the AI field has been focused on expert system software, AI (66) has also seen dramatic advances. Activity in the past years was characterized by new low-cost, powerful Lisp machines, the introduction of AI workstations, Lisp compilers becoming available for all major professional and engineering workstations, and the personal computer emerging as a (67) . tool for expert system development. The next few years will see this technology evolves further.

Because the (68) of an AI computer represents a sizable investment, companies should carefully (69) all options that are available as well as have a good idea of what the next generation of systems will offer in order to (70) the optimum system. This publication provides the information necessary to gain this understanding.

（68）是（）

A. choice

B. read

C. important

D. software

E. hardware

F. significant

G. emergence

H. survey

I. purchase

J. select
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