Which two prevent a servlet from handling requests.？（）
AThe servlet’s init method returns a non-zero status.
BThe servlet’s init method throws a Servlet Exception
CThe servlet’s init method sets the Servlet Response’s context length to 0
DThe servlet’s init method sets the Servlet Response’s content type to null.
EThe servlet’s init method does NOT return within a time period defined by the servlet container.
C200能支持最大ONU数是（）。
A、160个
B、320个
C、640个
D、1800个
若通过带内网管升级F820失败后，需要通过带外网管升级，需要如下连接线（）。
A、如果背后有串口，直接连接串口线
B、如果没有串口的F820，用三针串口线连接PC和MS8E单板，三针位置在X13处
C、4针调试线插在MS8E的带外网口上—4跟并排针X12处，RJ45水晶头连接PC机的网卡
D、直接用网线插在MS8E的第一个电口
When you are allowing RMAN to backup your archived redo log files，how does RMAN know which archived redo logs to back up from your archive log destination？（）
A、RMAN keeps a list of archive logs in a text file.
B、The DBA must manually tell RMAN which archive logs to backup.
C、RMAN has access to target control file and/or catalog information.
D、RMAN looks at the ARCHIVE_LOG_DEST parameter of your target database and backs up all archive logs found.
在网管上进行TrAP告警服务器配置时，SNMP版本、SNMP团体名和告警格式分别为（）、（）、SNMPTrAP。