以下一般应用于局域网的设备有()
A.接入服务器
B.调制解调器
C.Hub
D.以太网交换机
参考答案:C, D
有毒性的安神药是()
A.酸枣仁
B.远志
C.磁石
D.朱砂
E.琥珀
The mother told her son _____ in the street. [ ]
A. not play
B. to not play
C. doesn't play
D. not to play