In your project，you conducted communications requirements analysis to determine sum of information needs for all stakeholders．You have determined and limited who will communicate with whom and who will receive what information．One factor that you considered while doing communications requirements analysis is that for your project，the number of communication channels______．

A．increases in direct proportion to number of people

B．decreases in inverse proportion to number of people

C．increases in exponential proportion when number of people increases

D．none of the above number of communication channels depends on the type of your project

化学物质的哪些理化性质影响其毒效应（）

A.溶解性

B.大小

C.挥发性

D.比重

E.电离度和荷电性