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问题 单项选择题

烃类在极性溶剂中的溶解度与其分子结构大小有关，随着芳烃分子上侧链数目的增多以及烃类碳原子数的增大，在极性溶剂中的溶解度（）

A、增大

B、减小

C、不变

D、不确定

答案

参考答案：B

单项选择题 A1/A2型题

正常情况下血中血红蛋白不包括（）。

A.HbO2

B.Hbred

C.HbCO

D.SHb

E.Hi
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单项选择题

An internet is a combination of networks connected by (1).When a datagram goes from a source to a(2)，it will probably pass many (3)until it reaches the router attached to the destination network. A router receives a (4)from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5)is the optimum pathway?

空白（1）处应选择（）

A.modems

B.routers

C.switches

D.computers
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