保险事故是指保险合同约定的保险责任范围内的事故。( )
参考答案：对
-Would you like to come to dinner this Sunday, Xiaoming?
- _____
A．I'd love to, but I have many things to do
B．Oh, no. That'll be too tired
C．I'll stay at home
D．Yes, please
计算抗体滴度的平均滴度习惯上用（）
A.中位数
B.几何均数
C.众数
D.算术均数
E.百分位数
