用OTDR进行光纤测量按顺序可分为（）
A、曲线分析
B、数据获取
C、参数设置
D、波长设置
参考答案：A, B, C
He is very stubborn, it is impossible to argue _____________ what he doesn't want to .[ ]
A. with him about
B. against him about
C. him into doing
D. him to do
缩窄性心包炎多以急性心包炎后多长时间形成慢性缩窄性心包炎（）
A.一个月
B.二个月
C.六个月
D.十二个月
E.二十四个月
