当贴现率为15％时，某项目的净现值是340万元；当贴现率为18％时，净现值是－30万元，则其内部收益率是（）。
参考答案：17.76％
— Why didn't you buy the gold ring?
— I _____, but I didn't have the money. [ ]
A. would have
B. bought
C. would like to
D. had bought
水泵效率曲线上最高效率点附近的一定范围是水泵的（）。
A.工作区
B.工况区
C.运行区
D.高效区
