题型:填空题 已知圆C:x2+y2=1,点P(x0,y0)在直线x-y-2=0上,O为坐标原点,若圆C上存在点Q,使∠OPQ=30°,则x0的取值范围是( )A.[-1,1]B.[0,1]C.[-2,2]D.[0,2] 查看答案
题型:填空题 It is said that the big company _____ a new kind of car recently.[ ]A. has developed B. developed C. develops D. had developed 查看答案