溺水死亡大多是迅速发生,由于水灌入呼吸道内引起(),即刻致死。
A.出血
B.窒息
C.休克
D.痉挛
参考答案:B
The boy with his parents the Greener China since two years ago. [ ]
A. has joined
B. have been in
C. has been in
在linux系统中,查看系统中是否安装了dhcp的rpm包,应使用()命令。
A、rpm -qa|grep dhcp
B、rpm -qf|grep dhcp
C、rpm -qi|grep dhcp
D、rpm -ql|grep dhc