简述知觉差异的主要种类

A. it difficult for them to finish the job in time
B. difficult for them to finish the job in time
C. they have much difficulty to finish the job in time
D. that difficult for them to finish the job in time

A. 豆薯
B. 黄瓜
C. 莴苣
D. 菜豆

A. 投资项目的有效年限
B. 投资项目的现金流量
C. 企业要求的最低投资报酬率
D. 银行贷款利率