[多选] The current time zone for one of the user sessions is set to the database local time zone. For one application， the user session requires the time zone to be set to the local operating system time zone without affecting other user sessions. Which two solutions could the user implement to achieve this objective？（）

A . use the ALTER SYSTEM command to change the time zone
B . use the ALTER SESSION command to change the time zone
C . use the ALTER DATABASE command to change the time zone
D . set the value for the operating system variable ORA_SDTZ on the client machine
E . set the value for the operating system variable ORA_SDTZ on the database server machine

下面程序使用FileInfo类，实现指定目录下所有文本文件及属性的显示功能。请根据程序代码中的注释将程序补充完整。下列钢筋牌号属于光圆钢筋的有（）。 HPB235。 HPB300。 HRB335。 HRB400。 HRB500。甲在盗窃时被75岁的老妇发现，老妇喊“捉贼”，被甲打了一耳光。老妇上前夺被甲拿走的戒指时，又被甲推了一把。老妇趁甲在翻其他东西时，拿起斧头向甲的脑袋砸去，致甲重伤。老妇的行为属于（）。正当防卫。防卫过当。故意伤害。事后防卫。固体绝缘材料吸水后的介电系数比干燥状态下的介电系数（）。增加。不变。减小。 How many CallManager clusters can an IPCC Express cluster with High Availability communicate with? （） 1。 2。 Depends upon the number of agents。 Depends upon the locations of the CallManager clusters。 Depends upon how many nodes are in the CallManager cluster。 The current time zone for one of the user sessions is set to the database local time zone. For one application， the user session requires the time zone to be set to the local operating system time zone without affecting other user sessions. Which two solutions could the user implement to achieve this objective？（）

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