下列关于烷化剂的描述正确的是
A.结构中不含有载体部分B.是乙撑亚胺类化合物的总称C.是氯丙胺类化合物的总称D.长春新碱为该类药物E.又称生物烷化剂
参考答案:E
实体可以表示实际存在的事物,也可以表示______。
With respect to a capital budgeting analysis, which of the following is most likely included in the computation of a project's cash flow()
A. Sunk costs.
B. Financing costs.
C. Opportunity costs.