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问题 单项选择题

下列各项不是爆炸品货物对汽车运输工作的要求的是（）

A.慎重选择运输工具

B.不得擅自改变行驶路线

C.车上无押运人员不得单独行驶

D.需要丢弃时，要注意环境安全

答案

参考答案：D

多项选择题

易发霉的中药饮片有（）

A.蜈蚣

B.水蛭

C.僵蚕

D.蕲蛇

E.胆矾
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单项选择题

Flow control is a function that prevents network congestion by ensuring that (1) do not overwhelm (2) with data. There are three commonly used methods for handling network congestion. (3) is used by network devices to temporarily store bursts of excess data in memory until they can be processed. (4) are used by receiving devices to help prevent their buffers from overflowing. (5) 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.

4（）

A．Buffer

B．Source-quench messages

C．Buffering

D．Windowing
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