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问题 单项选择题

下列说法不正的是：（）。

A.地表形态的变化需要经历漫长的时间，不可能短间内改变

B.喜马拉雅山地岩层中发现的海洋生物化石说明这曾经是海洋

C.沧海桑田的变化是地壳运动期作用的结果

D.岩石在运动过程中会引起地震

答案

参考答案：A

单项选择题 案例分析题

病历摘要：女性，45岁，右 * * 小片红色斑丘疹及斑块1年，基底浸润。曾于当地医院拟“湿疹”多次治疗，效果欠佳。半年前，在原有皮损基础上出现糜烂及溃疡，少许渗液。该患者行病理活检示：表皮内巢状排列的异常细胞，胞体大圆形胞内含一个大的胞核，胞质丰富而淡染，空泡状，PAS反应阳性

该患者治疗（）

A. * * 切除术

B.局部放疗

C.外用皮质激素

D.外用维甲酸软膏

E.激光治疗
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单项选择题

We have already covered the topic of network addresses. The first  (1) in a block (in classes A, B, and C) defines the network address. In classes A, B, and C,if the hostid is all ls,the address is called a direct broadcast address. It is used by a(2) to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a (3) address in an IP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A,B，and C． In classes A, B, and C, an address with all ls for the netid and hostid (32bits) define a (4) address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However, a router will block a packet having this type of address to confine the broadcasting to the (5) network. Note that this address belongs to class E.

空白（2）处应选择（）

A.router

B.switch

C.hub

D.firewall
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