题干
——Thanks for inviting me to your party.
——__________.
A：Never mind
B：Don't say so
C：My pleasure
D：Yes, please
答案(点此获取答案解析）
C
——Thanks for inviting me to your party.
——__________.
A：Never mind
B：Don't say so
C：My pleasure
D：Yes, please
作圆
的两条切线，切点分别为A，B，已知
，若
,则
的最小值是