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【单选题】
关于HDLC协议的流量控制机制，下面的描述中正确的是（ ）。A.
信息帧(I)和管理帧(S)的控制字段都包含发送顺序号
B.
当控制字段C为8位长时，发送顺序号的变化范围是0～127
C.
发送完一个信息帧(I)后，发送器就将其发送窗口向前移动一格
D.
接收器成功接收到一个帧后，就将其接收窗口后沿向前移动一格
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【单选题】The theory also seems to explain the sudden and unexpected popularity of certain looks, (brands), or neighborhoods.
A.
品牌，牌子；类型；打烙印于
B.
带
C.
闸
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【单选题】The author mentioned Intel in order to______.
A.
explain the recovery in demand for chips still takes time.
B.
show the chip market is not so gloomy as some economists predicted.
C.
illustrate Intel is the only chipmaker not affected by the tough market.
D.
tell Intel's sales rise is mainly attributable to its monopoly of the market.
【单选题】Explain: a sudden strong feeling of fear or nervousness that makes you unable to thing clearly or behave sensibly
A.
spill
B.
splash
C.
panic
D.
steer
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