TWC-43机车电台应采用哪种保险管（）.
A.1A
B.3A
C.5A
参考答案：B
- You seem familiar with Mr. John?
-Of course, we_______ together for three years in the 1990s.
A．have worked
B．were working
C．are working
D．worked
对组织活动的场地必须（）
A.打电话联系
B.通过网络信息传输
C.实地查看
D.通过他人打听
