IMSI分析的作用是（）.
A.位置更新
B.MO呼叫处理
C.MAP版本协商
参考答案：A, B, C
ZD6D型电动转辙机故障电流要求2.3-2.9A。
—What's _______ with your hand?
—Nothing serious. It was hit just now.
A. the wrong
B. the matter
C. matter
D. trouble
