BSS
参考答案:
基站子系统,包括BTS和BSC,为移动台和交换机实现通信连接。
句型转换
1. David likes watching basketball matches on TV. (改为否定句)
David ______ ______ watching basketball matches on TV.
2. Betty often buys things on the Internet. (改为一般疑问句并作肯定回答)
______ Betty often ______ things on the Internet?
Yes, she ______ .
3. I usually go to school at seven o'clock. (对划线部分提问)
______ ______ do you go to school at seven o'clock?
4. My father uses the computer to make travel plans. (对划线部分提问)
______ ______ your father ______ the computer to ______ ?
5. Click"save",you can save the document. (对划线部分提问)
______ can I save the document?
关于安氏Ⅱ类错,下列说法不正确的是()
A.安氏Ⅱ类错是一个单纯的错类型
B.安氏Ⅱ类错中大多数上颌骨位正常
C.在上颌骨位置异常者中,上颌后明显多于上颌前突
D.上牙弓后缩多于上牙弓前突
E.安氏Ⅱ类错中约60%患者下颌后缩