问题
选择题
Please take the notebook _____ your brother. [ ]
A. in
B. to
C. on
D. at
答案
答案：B
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Please take the notebook _____ your brother. [ ]
A. in
B. to
C. on
D. at
答案：B
设有两个事务T1和T2，其并发操作序列如下表所示。则下面说法中正确的是
| 步骤 | T1 | T2 |
| 1 | 读A=100 | |
| 2 | 读A=100 | |
| 3 | A←A+10写回 | |
| 4 | A←A-10写回 |
A．该操作序列不存在问题
B．该操作序列丢失修改
C．该操作序列不能重复读
D．该操作序列读出“脏”数据