正态曲线下面积有一定的规律，μ±2σ的面积占总面积的()
A．80.5%
B．85.5%
C．88.5%
D．90.5%
E．95.5%
参考答案：E
If he ___ the money, he ___ a lot of clothes.[ ]
A. has; will buy
B. had; bought
C. had; would buy
D. had; will buy
质量检验的定义？
