题目内容
解决并发操作带来的数据不一致问题普遍采用封锁技术。
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关系代数优化规则中，花费时间最长的运算要尽量先做。
— Let's _______ basketball.— That _______ good.
—Let's go fishing if it ____ this weekend.—But nobody knows if it ____.
—Jeff, could you tell me if it___ tomorrow. If it ____tomorrow, I will stay at home.—It's reported that it will be sunny, let's go camping on the Fenghuang mountain.
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