题目

 Only        to use this reading room. Students have another room on the second floor.   A. are the teachers allowed                          B. are allowed the teachers   C. the teachers are allowed                          D. the teachers allowed 答案：C（2013雅安）在平面直角坐标系中，已知点A（，0），B（，0），点C在坐标轴上，且AC＋BC＝6，写出满足条件的所有点C的坐标：________．