问题如下：
The crossover rate of two projects on NPV profiles means:
选项：
A.NPVs of two projects are equal.
B.IRRs of two projects are equal.
C.NPV of one project is zero.
解释：
A is correct. Crossover rate is where the two projects’ NPV profiles intersect. It means NPVs of two projects are equal at this discount rate.
IRR discount rate 以及 cost of capital 的区别是什么？如何区分和记忆。
