设圆x2+y2=1的一条切线与x轴、y轴分别交于A，B两点，则线段AB长度的最小值为（ ）。
2
加油卡客户开具发票类型又分为（）。
A.定额发票
B.手写发票
C.增值税发票
D.普通发票
The receiving activities conduct analyses of the requirements with the requirements provider to ensure that a compatible, shared understanding is reached on the meaning of the requirements. The result ofthis analysis and dialog is an（）set of requirements.
A.agreed-to
B.agree-to
C.agree-to-do
D.agree-with
