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问题 多项选择题

使用PC机可以运行自动获取IP地址，DHCP服务器就可以分配给PC机IP地址了，关于PC机获取地址时的命令介绍正确的是（）。

A.在用户PC机的Windows 7/Windows XP环境下使用ipconfig/release命令来主动释放IP地址，此时用户PC机向DHCP服务器发送的是DHCP REQUEST报文

B.在用户PC机的Windows 7/Windows XP环境下使用ipconfig/release命令来主动释放IP地址，此时用户PC机向DHCP服务器发送的是DHCP RELEASE报文

C.在用户PC机的Windows 7/Windows XP环境下使用ipconfig/renew命令来申请新的IP地址，此时用户PC机向DHCP服务器发送的是DHCP RENEW报文

D.在用户PC机的Windows 7/Windows XP环境下使用ipconfig/renew命令来申请新的IP地址，此时用户PC机向DHCP服务器发送的是DHCP DISCOVER报文

答案

参考答案：B, D

补全对话，情景问答
补全对话。　
Dong: Alice, what were you doing when the fire started?
Alice: 1.            
Dong: Did you smell smoke?
Alice: 2.            
Dong: Where was she?
Alice: She was playing in the gym.
Dong: 3.            
Alice: He was eating lunch in the cafeteria. 4.            
Dong: When the fire started, I was talking on the telephone.
Alice: What did you do?
Dong: 5.            
Alice: Good for you!
A. What was John doing?
B. I was studying in the library.
C. I called the fire department.
D. No, but Meimei did.
E. Where were you, Dong?
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单项选择题

甲将收藏的一件古董卖给乙，乙当场付清价金，约定甲10天后交货。丙听说后，表示愿以双倍的价钱购买。甲当即决定卖给丙，约定第3天交货，并收定金1万元，乙听说此事后，哄甲8岁儿子将古董从家中取出交给他。现对该古董所有权的归属，下列判断正确的是哪项( )

A．乙已取得古董的占有，可认为甲已履行合同，所有权归乙
B．所有权仍属于甲
C．甲又卖给丙的行为有违诚实信用原则，应认定无效，所有权属于乙
D．因对丙的合同所约定的交货期限较早，故应属于丙
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