引起小儿尿频的病因较多，其中最多见的是A．风热 B．湿热 C．肾虚 D．脾虚 E．肺

下列哪种病毒感染可致中枢神经系统感染()

A．HCV

B．HSV

C．HAV

D．EBV

E．HBV

营业税中所指的"境内"是指实际税收行政管理的区域，具体情况不包括（）。

A.所提供的劳务发生在境内

B.在境内载运旅客或货物出境

C.转让的无形资产在境内使用

D.在境内销售商品

We have already covered the topic of network addresses. The first （） 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.（） 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 （） 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 is for the netid and hostid (32 bits) defines a（） 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 ofaddress to confine the broadcasting to the （） network. Note that this address belongs to class E.

Note that this address can be used only as a （） 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.

A．source

B．destination

C．local

D．remote

法与政治的区别主要表现在（）。

A.反映的内容不同

B.在上层建筑中的地位不同

C.形式不同

D.调控的功能不同