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问题 单项选择题

20岁男性，面部上肢大小不等棕色略突出皮肤的圆圈，病理可见角化不全柱，其下角质形成细胞变性。可能的诊断为（）

A.点状掌跖角皮症

B.弥漫性掌跖角皮症

C.汗孔角化症

D.性联寻常型鱼鳞病

E.寻常型鱼鳞病

答案

参考答案：C

单项选择题

One ofthe main resposibilities ofICMP is to report  （） . Although technology hasproduced increasingly relaible transmission media, errors still exist and must be handled. IP isan  （）  protocol. This means that error checking and error control are not a concem ofIP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP doesnot  （） errors, it simply report them. Error correction is left to the higher-levelpotocols. Error messages are always sent to the original  （）  because the only informationavailable in the datagram about the route is the source and destination IP addresses. ICMP usethe source IP address to sent the error massage to the source ofthe（）.

Error messages are always sent to the original（）because the only informationavailable in the datagram about the route is the source and destination IP addresses.

A．user

B．destination

C．source

D．program
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单项选择题

windows98中，文件标识符由（）组成。

A、盘符，文件名

B、盘符，路径，文件名

C、盘符，路径，文件主名

D、盘符，路径
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