[单项选择]Which is correct of the planned visit to Vietnam by a team of U. S. senior officials
A. The visit is fixed for next month. B. The visit won’t come quickly or easily, C. The visit is focused on Vietnam’s reform. D. The visit is focused on a comprehensive treaty.
第24题: [单项选择]事务A对某数据项D加了X锁,则以下说法正确的是______。 A. 允许事务A读取数据项D,其他事务不能再对数据项D进行任何操作 B. 允许事务A读取数据项D,其他事务可对数据项D进行加S锁 C. 允许事务A读取或者修改数据项D,其他事务不能再对数据项D进行任何操作 D. 允许事务A读取或者修改数据项D,其他事务可对数据项D进行加S锁 参考答案:C