题目

直线的倾斜角是（      ）。A          B            C              D         答案：正解：D。由题意得：κ=  在[0，π]内正切值为κ的角唯一  倾斜角为误解:倾斜角与题中显示的角混为一谈。 听一段对话，回答第1-2小题。1. Who are the two speakers? A. Father and daughter. B. Two friends. C. Teacher and student. 2. What are they talking about? A. About a good friend. B. About learning English. C. About learning Chinese.