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问题 多项选择题

家庭网关（e8）应支持根据（）等信息，对用户数据流进行分类。

A.源/目的MAC

B.源/目的IP

C.协议（如TCP、UDP、RTP协议等）

D.源/目的端口号

答案

参考答案：A, B, C, D

单项选择题

病例4：女性，69岁，退休工人，近3年来逐渐出现特别好忘事，做事经常丢三落四，近一年不会自己穿衣服，有时把裤子当衣服“穿”，有时对着镜子中的自己问“你是谁呀”，2周前一个人跑出家门，找不到回家的路，说不清地址，说不上自己的名字，幸被邻居碰上才未发生意外。

首先考虑的诊断是( )

A．VD

B．精神发育迟滞

C．遗忘障碍

D．阿尔茨海默病
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单项选择题

The great advance (91) rocket theory 40 years ago showed that liquid-fuel rockets were far (92) in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. (93) , during the last decade, large solid-fuel rockets with (94) fuels about as powerful as liquid fuels have (95) their appearance, and it is a favorite layperson’s question to (96) which one is "better". The question is meaningless. (97) might as well ask whether a gasoline or a diesel engine is "better". It all (98) on the purpose. A liquid-fuel rocket is complicated, (99) has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when (100) . (101) , the thrust can be made to vary by adjusting the speed of the fuel pumps. A solid-fuel rocket, on the other hand, is rather (102) in construction, (103) hard to build when a really (104) size is desired. But once you have a solid-fuel rocket, it is ready for action (105) very short notice. A liquid-fuel rocket has to be fueled first and cannot be (106) readiness for very long after it has been fueled. (107) , once a solid-fuel rocket has been ignited, it will keep burning. It cannot be stopped and reignited (108) desired (it could conceivably be stopped and reignited after a pre-calculated time of burning has elapsed, and its thrust cannot be varied. Because a solid-fuel rocket can be kept ready for a long time, most military missiles (109) solid fuels, but human-piloted spaceflight needs the fine adjustments that can (110) be provided by liquid fuels.

A．stayed

B．controlled

C．detained

D．held
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