剪力的单位是()
A.牛顿
B.牛顿/米
C.牛顿•米
D.牛顿/平方米
参考答案:A
Sorry, I ______ when you spoke. I was thinking about something else. [ ]
A. isn't listening
B. hasn't listened
C. didn't listen
D. wasn't listening
随着现代投资组合理论的诞生,证券投资分析开始形成了界限分明的三个基本的分析流派,即基本分析流派、心理分析流派和学术分析流派。( )