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问题 填空题

若点M（m-3，m+1）在平面直角坐标系的x轴上，则点M的坐标为______．

答案

∵点M（m-3，m+1）在平面直角坐标系的x轴上，

∴m+1=0，

解得m=-1，

∴m-3=-1-3=-4，

点M的坐标为（-4，0）．

故答案为：（-4，0）．

单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

In low - speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high - speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected.

3（）

A．collision

B．congestion

C．drop

D．delay
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问答题 论述题

叙述怎样减缓汽车动力性下降？
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