纯净的CaCO₃可以用来测定盐酸的浓度．采用适当的试剂，从石灰石（主要成分是CaCO₃）获得高纯度CaCO₃的流程如下：

试回答：

①固体A是______；气体B是______；试剂①是______；试剂②是______．

②石灰石煅烧的化学方程式是______．

③使原料中各原子的利用率达到100%，是“绿色化学”的核心理念之一．上述流程中有的物质可以再利用，它是______．

In considering project stakeholders, the project management team must do all of the following EXCEPT:

A．As much as possible, create conflicts among stakeholders to allow the project team to get its work don

B．Identify the stakeholder

C．Determine stakeholders requirements and expectation

D．To the extent possible, manage stakeholders influence in relation to the requirements to ensure a successful projec