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问题 单项选择题

在允许速度不大于120km/h的正线、到发线上垫入或撤出冻害垫板，其顺坡长度不应小于冻起高度的（）。

A.200倍

B.350倍

C.500倍

D.600倍

答案

参考答案：D

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.

68（）

A．path

B．rout

C．circuit

D．way
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单项选择题

患者，近日洗头后渐出现头痛如裹，肢体困重，纳呆胸闷，小便不利，大便溏泻，苔白腻，脉濡。治则为

A．疏散风寒
B．疏风清热
C．祛风胜湿
D．化痰降逆
E．以上都不是
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