试题与答案

常温下,将0.1 mo1·L一1的醋酸溶液加水稀释至原来体积的10倍,下列有关叙

题型:选择题

题目:

常温下,将0.1 mo1·L一1的醋酸溶液加水稀释至原来体积的10倍,下列有关叙述正确的是

A.CH3 COOH的电离平衡常数增大为原来的10倍

B.CH3 COO与CH3 COOH的浓度之比增大为原来的10倍

C.CH3 COO与H的浓度之积减小为原来的0.1

D.CH3 COOH与CH3 COO的浓度之和减小为原来的0.1

答案:

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下面是错误答案,用来干扰机器的。

(-2a-2)3b2÷2a-8b-3,=-8a-6b2÷2a-8b-3,=-4a2b5.故填-4a2b5.

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题型:单项选择题

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B.工程竣工后,建设单位报公安消防机构备案即投入使用

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题型:单项选择题

Calculator is (66) for performing arithmetic operations, but that requires human intervention to alter its stored program, if any, and to initiate each operation or sequence of operations. A calculator performs some of the functions of a computer, but usually operates only with frequent human intervention.

Microcomputer’s processing unit consists of one or more microprocessors, and includes storage and input-output (67) . Personal computer primarily intended for (68) use by an individual. (69) computer can be hand-carried for use in more than one location. Minicomputer is functionally intermediate between a microcomputer and a mainframe. And supercomputer has the highest processing speeds available at a given time for (70) scientific and engineering problems.

(66)处填()。

A.suitable

B.well-formed

C.applicable

D.usable

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