GSM移动通信系统由()部分组成
A、网络交换子系统(NSS)
B、基站子系统(BSS)
C、操作维护中心(OMC.
D、移动台(MS)
参考答案:A, B, D
选用because或because of填空。
1. _____ his bad leg, he couldn't walk so fast as others.
2. They didn't go swimming _____ it was raining hard.
3. —Why can't you do it now?
—_____ I'm too busy.
4. He didn't come today _____ his illness.
肺炎时可减轻胸痛的最常用体位是()
A.患侧卧位
B.仰卧位
C.端坐位
D.健侧卧位
E.俯卧位