未插尾纤的光口板，其光口必须用（）进行防尘处理。

Compared with the net present value (NPV) method, the internal rate of return (IRR) method of evaluating investment projects:()

A. is the preferred method for evaluating mutually exclusive projects.

B. is not sensitive to the pattern or timing of the cash flows from the period.

C. assumes that all cash flows from the project will be reinvested at the computed IRR.