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问题 单项选择题 A1型题

8个月的小儿运动发育应是下列哪项

A．俯卧位有反射性匍匐动作

B．俯卧能交替踢腿

C．用手撑起上身数分钟

D．用双上肢向前爬

E．腹部离开床面，手与膝关节支撑爬

答案

参考答案：D

单项选择题

To a router, a flow is a (1) of packets that share the same characterstics, such as traveling the same (2) , using the same (3) , having the same kind of security, and so on. A router that suppors the handling of flow labels has a (4) table. The table has an entry for each active flow label; each entry defines the (5) required by the corresponding flow label.

2（）

A．path

B．rout

C．circuit

D．way
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单项选择题

下列说法中，所含光学知识原理达两种以上的是（）

A.镜中花，水中月

B.凸透镜

C.海市蜃楼

D.潭清疑水浅
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