[单选] Application A holds an Update lock on a single row and application B is trying to read that row. If both applications are using isolation level UR, which of the following will occur?（）

土壤水解性酸 联轴器的作用是什么？ The system administrator is making system wide changes to a server, which will add to the PATH variable for the server environment. Where is the PATH variable found for the system?（） /profile。 /etc/envpath。 /etc/profile。 /etc/environment。 可燃气体检测仪的蜂鸣（）越高表明气体泄漏浓度越高。 幅度。 频率。 声音。 高度。 利用磷酸盐缓冲液或磷酸钙，为何能保持培养基pH值的稳定性？ Application A holds an Update lock on a single row and application B is trying to read that row. If both applications are using isolation level UR, which of the following will occur?（）