若事务T对数据对象A加了S锁,则其他事务只能对数据A再加____,不能加____,直到事务 T释放 A上的锁。
解决并发操作带来的数据不一致性总是普遍采用封锁。【 】
A. 对
B. 错
E-business can reduce costs of production by not having ___1______ and reducing ___2____ costs.It opens the opportunity to access new markets ______3__________ and target market segments more effectively. It also improves customer service ___4_______ and employee ____5___ through flexible working methods.
价值规律的表现形式是:
A. 商品价格由价值决定并受供求关系的影响自发地围绕着价值上下波动
B. 商品价值受供求关系的影响自发地围绕着价格上下波动
C. 商品价格由价值决定并受供求关系的影响自发地围绕着价值左右波动
D. 商品价值受供求关系的影响自发地围绕着价格左右波动