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问题 单项选择题

医疗单位必须获得省级公安、环保和药品监督管理部门核发的使用许可证后才能使用的药品是

A．化学原料药
B．诊断药品
C．易制毒化学品
D．放射性药品
E．戒毒药品

答案

参考答案：D

单项选择题

邮政发展代办电信业务的核心优势有资源优势、品牌优势、网络优势和（）。

A、渠道优势

B、价格优势

C、促销优势

D、产品优势
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单项选择题

Flow control is a function that prevents network congestion by ensuring that (66) do not over-whelm (67) with data. There are three commonly used methods for handling network congestion. (68) is used by network devices to temporarily store bursts of excess data in memory until they can be processed. (69) are used by receiving devices to help prevent their buffers from overflowing. (70) is a flow-control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.

A．Buffer

B．Source-quench messages

C．window

D．Windowing

E．Buffering
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