You are project manager leading a US $4000000 mechanical engineering project．To date，you’ve been leading the other 11 people who comprise the overall project team．Lately you’ve noticed that you are spread too thin and the schedule is being negatively impacted．Because the project is date constrained，you convinced senior management to accept a cost variance and add a senior quality assurance analyst to the project team．This new resource will work directly with the three project team members who comprise the testing subteam．How many more communication channels will there be on the project team

A．12．

B．11．

C．78．

D．66．

生产环境中最常见的生产性粉尘是( )。

A．无机性粉尘

B．有机性粉尘

C．金属性粉尘

D．混合性粉尘