GSM系统的广播信道分为三种()、()和()。
参考答案:频率校正信道FCCH;同步信道SCH;广播控制信道BCCH
直线x-4y-1=0与直线2x+y=0的交点坐标是______.
句型转换,我能行!
1. He breaks his tail. (变成一般疑问句)
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2. My mother often goes to work by bus. (就划线部分提问)
3. My mother is a teacher. (就划线部分提问)
4. want, eat, do, what, to, you (连词成句)