You are the project manager of an IT company．You are in the process of creating a collection and filing structure that details what methods will be used to gather and store various types of information．Procedures should also cover collecting and disseminating updates and corrections to previously distributed material．Where will you include this information

A．Information retrieval syste

B．Information distribution method

C．Communications management pla

D．Project record

在诊断能量范围内，X线与物质作用时，不发生的效应是()

A．相干散射和光电效应

B．光电效应和康普顿效应

C．相干散射

D．康普顿效应

E．电子对效应和光核反应