问题
单项选择题
NO.7信令系统采用比特填充的方法防止其他字段中出现（）
A.伪标志码
B.标志码
C.校验码
D.前项序号
答案
参考答案：A
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NO.7信令系统采用比特填充的方法防止其他字段中出现（）
A.伪标志码
B.标志码
C.校验码
D.前项序号
参考答案：A
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| My name is Li Hua. I’m thirteen. I’m a middle school student. I am 1 Class Five, Grade Seven. My English teacher 2 Mr. Lin. He is 3 old teacher. I _4__ a pen, a ruler and two __5__. I have a bike, 6 .Liu Ping is in my class. She is a girl. We 7 good friends. She is not 8 today. I think she is at home. Look! Here is a 9 . But it is not my book. I think it is 10 book. | ||||
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