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问题 单项选择题

（）是对同一物体的凹凸程度或不同物体的近远程度的知觉，它对于了解环境中各种物体的位置排列从而引导人的运动活动。

A．大小知觉

B．方位知觉

C．深度知觉

D．时间知觉

答案

参考答案：C

解析：深度知觉是对同一物体的凹凸程度或不同物体的近远程度的知觉，它对于了解环境中各种物体的位置排列从而引导人的运动活动，是非常重要的。

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 (71) between sending the notification and notification arriving at the source thousands of additional (72) may arrive．InATMnetwork，amajortoolfor preventing (73) is (74) control. When ahostwants a new virtual (75) , it must describe the traffic to be offered and the service expected.

A．interval

B．time

C．slot

D．delay
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问答题

(5)若C公司2003年4月1日购入B公司债券，且必要报酬率为12%，则B债券价值为多少
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