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【单选题】
8线－3线优先编码器74LS148接通电源后，其选通输出端输出低电平，则其原因可能是：A.
无有效编码输入
B.
电源有问题
C.
选通输入端 没有接地
D.
扩展端 没有接高电平
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【简答题】帧 格式为 1 个起始位, 8 个数据位和 1 个停止位的异步串行通信方式是方式
【单选题】British people say “please” and “thank you” all ________ time , and they always keep their voice down in ________ poblic.( )
A.
． a ； the
B.
． the ； /
C.
． / ； a
D.
． / ； /
【单选题】Every Dog Has His Say Kimiko Fukuda always wondered what her dog was trying to say．Whenever she put on make up，it would pull at her sleeve．______（1）． When the dog barks，she glances at a small electron...
A.
A wireless microphone is attached to the dog’s collar，which sends information to the gadget held by the owner．
B.
Nobody really knows how a dog feels
C.
This translated as “Don’t come this way”
D.
More customers are expected when the English version is launched this summer．
E.
Now，the Japanese girl thinks she knows．
F.
Each one of these emotions then linked to a phrase like “Let’s play'，“Look at me'，or “Spend more time with me” 第 16 题 请选择（1）处的最佳答案．
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