己烷紫外吸光度240-280小于()Abs合格。
A.0.01
B.0.05
C.0.15
D.1.5
参考答案:C
三障
Which of the following types of profit is most likely the level of accounting profit needed to just cover the implicit opportunity costs ignored in accounting costs()
A. Normal profit.
B. Economic profit.
C. Accounting profit.