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问题 单项选择题

相对而言，对于调动学生的积极性、主动性和创造性，培养学生的兴趣特长，丰富学生的精神生活，促进学生个性发展和思想品德的形成具有主要意义的课程是（）。

A.分科课程

B.经验课程

C.综合课程

D.隐形课程

答案

参考答案：B

单项选择题

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 (64) between sending the notification and notification arriving at the source, thousands of additional (65) may arrive. In ATM network , a major tool for pre- venting (66) is (67) control. When a host wants a new virtual (68) , it must describe the traffic to be offered and the service expected.

65（）

A．packets

B．cells

C．message

D．files
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单项选择题

以下说法中正确的是：（）

A.牛顿第一定律揭示了一切物体都具有惯性

B.速度大的物体惯性大，速度小的物体惯性小

C.力是维持物体运动的原因

D.做曲线运动的质点，若将所有外力都撤去，则该质点因惯性仍可做曲线运动
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