旅客列车乘务组由（）乘务员组成。 ["餐车","客运人员","公安乘警","车辆"]
有效波
What can be done to secure the virtual terminal interfaces on a router?（） [" Administratively shut down the interface."," Physically secure the interface."," Create an access list and apply it to the virtual terminal interfaces with the access-group command."," Configure a virtual terminal password and login process."," Enter an access list and apply it to the virtual terminal interfaces using the access-class command."]
流程图式
环境生物技术
社会抑制作用
