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问题 单项选择题

下列哪些交换机性能指标的改变不能提高网络吞吐量（）

A.交换容量的加大

B.交换带宽

C.增加端口

D.提高转发速率

答案

参考答案：C

补全对话，情景问答
从方框中选择最佳选项完成对话，有两项多余。
A. Where can I smoke, then?
B. It says "No smoking in public!"
C. How long have you been smoking?
D. Would you mind my smoking in the office next door?
E. Smoking is bad for your health.
F. Thanks for your advice.
G. Could you please show me the way?
A: Excuse me, may I smoke here?
B: Look at the sign, please. 1._____
A: 2._____
B: I' m afraid not. All the offices are nonsmoking areas.
A: Oh, dear! 3._____
B: There is a smoking room on the first floor.  Perhaps you can smoke there.
A: Sorry. I 'm new here. 4._____
B: Sure. Follow me, please. I'm afraid smoking is bad for your health. You'd better give it up.
A: 5._____I'll think about it.
1._____2._____3._____4._____5._____
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问答题

如图，有一高台离地面的高度h=5.0m，摩托车运动员以v0=10m/s的初速度冲上高台后，以vt=7.5m/s的速度水平飞出．摩托车从坡底冲上高台过程中，历时t=16s，发动机的功率恒为P=1.8kW．人和车的总质量m=1.8×102kg（可视为质点）．不计空气阻力，重力加速度取g=10m/s2．求：

（1）摩托车的落地点到高台的水平距离；

（2）摩托车落地时速度的大小；

（3）摩托车冲上高台过程中克服摩擦阻力所做的功．
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