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问题 单项选择题 A1/A2型题

女性，40岁，突然昏迷，抽搐，呼气有大蒜味，瞳孔明显缩小，皮肤冷汗，两肺湿啰音，下列哪种疾病可能性大（）

A.一氧化碳中毒

B.安定中毒

C.脑出血

D.有机磷农药中毒

E.蛛网膜下腔出血

答案

参考答案：D

解答题

在观察洋葱鳞片叶表皮细胞结构中，选取的材料越大越好______．
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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（3）处应选择（）

A.source

B.destination

C.local

D.remote
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