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问题 单项选择题

对数据表进行筛选操作，结果是

A．只显示满足条件的记录，将不满足条件的记录从表中删除

B．显示满足条件的记录，并将这些记录保存在一个新表中

C．只显示满足条件的记录，不满足条件的记录被隐藏

D．将满足条件的记录和不满足条件的记录分为两个表进行显示

答案

参考答案：C

解析： 本题考查的是数据库、表的基本操作。筛选功能是从众多的数据中挑选出一部分满足某种条件的数据进行处理，经过筛选后的表，只显示满足条件的记录，而不满足条件的记录将被隐藏起来。

选择题

在下列四种反应条件下，锌和盐酸反应速率最快的是

A．20°C 时，将锌片放入0.01mol.L-1的稀盐酸中

B．20°C 时，将锌片放入0.1mol.L-1的稀盐酸中

C．50°C 时，将锌片放入0.01mol.L-1的稀盐酸中

D．50°C 时，将锌片放入0.1mol.L-1的稀盐酸中
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单项选择题

The demand for oil is more inelastic in the short-run than the supply of oil, but it is not perfectly inelastic. Based only on this factor, if the government imposes a $ 5.00 per barrel tax on oil producers :（）

A. The incidence of the tax will fall most heavily on oil producers, because the tax is imposed directly on them.

B. The incidence of the tax will be split between oil producers and oil consumers, with most of the tax being paid by oil producers.

C. The incidence of the tax will be split between oil producers and oil consumers, with most of the tax being paid by oil consumers.
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