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问题 选择题

教育部曾发布《中小学伤害事故处理办法》、《中小学幼儿园安全管理办法》等，明确了校园伤害事故的防范和处理措施。这是对未成年人的（     ）

A．家庭保护

B．学校保护

C．社会保护

D．司法保护

答案

答案：C

本题考查社会保护的理解。社会保护是指社会在社会生活环境中对未成年人实施的保护。社会有义务为未成年人提供好的条件、场所禁止他们参加一些不利于其健康成长的活动。

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（3）处应选择（）

A.source

B.destination

C.local

D.remote
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单项选择题

不同来源的同种细菌称为

A．种
B．亚种
C．菌株
D．型
E．异种
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