问题
多项选择题
串行异步通信的字符格式由( )组成。
A．起始位
B．SYN字符
C．数据位
D．校验位
E．停止位
答案
参考答案：A,C,D,E
解析： 本题考查的知识点为串行异步通信的字符格式。
[要点透析] 每个串行字符有四个部分组成：1个起始位，5-8个数据位，1个奇偶校验位，1～2个终止位。
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串行异步通信的字符格式由( )组成。
A．起始位
B．SYN字符
C．数据位
D．校验位
E．停止位
参考答案：A,C,D,E
解析： 本题考查的知识点为串行异步通信的字符格式。
[要点透析] 每个串行字符有四个部分组成：1个起始位，5-8个数据位，1个奇偶校验位，1～2个终止位。
| 完型填空。通读下面短文，掌握其大意，然后从四个选项中选出一个最佳答案。 |
| The train I was travelling 1 was already half 2 hour late. I had planned to 3 in London at 7:00 4 to catch the 7:50 train to Liverpool, but there was no hope 5 that now. I explained (解释) the situation (情况) to the conductor 6 advised 7 to get off at the stop before London Station and 8 a taxi. When the time came, he even helped me 9 my luggage. He wished me good 10 as I jumped off, and 11 minutes after I was racing towards London Station in a taxi. It was 12 7:50 when we stopped outside the station. I 13 the driver quickly and hurried inside. " The Liverpool train " was all I had time to 14 to the first porter I saw. You can imagine my disappointment when he pointed to a train that was just moving 15 of the station. |
| ( ) 1. A with ( ) 2. A a ( ) 3. A arrive ( ) 4. A so ( ) 5. A for ( ) 6. A when ( ) 7. A I ( ) 8. A put ( ) 9. A in ( )10. A luck ( )11. A few ( )12. A over ( )13. A spent ( )14. A say ( )15. A to | B on B an B get B that B in B where B me B carry B to B luckily B a few B more B paid B speak B through | C at C the C get to C in order C on C what C my C by C with C to come C little C then C cost C tell C out | D of D / D go D but D to D who D mine D take D for D to go D a little D about D took D talk D away |