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问题 填空题

数据库中，每个事务都感觉不到系统中其他事务在并发地执行，这一特性称为事务的 【15】 。

答案

参考答案：隔离性

单项选择题

The CPU does not have to look (66) all of RAM to find the spot it needs. But RAM only (67) the data temporarily. As soon as you switch the computer (68) , all that information disappears from the RAM. When you switch the computer on again, the RAM is (69) , and ready (70) a new program and new data.

（70）处填（）。

A．receive

B．be received

C．receiving

D．received
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单项选择题 A1型题

铸造卡环和锻丝卡环联合应用的目的是（）

A.充分发挥各自的优点

B.方便患者取、戴义齿

C.不易储存食物

D.美观、价廉

E.舒适、耐用
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