丙烯进料泵一般可采用()。
A、离心泵
B、高速离心泵
C、多级离心泵
D、往复泵
参考答案:B, C
Distribution information involves making information available to project stakeholders in a timely manner.Which of the following tools can you use in the distribution information process
A.Organizational process asset
B.Communication metho
C.Performance reportin
D.Communications requirement analysi
构造主义认为,了解人们的直接经验要靠被试自己对经验的观察和描述,这种研究方法被称为()
A.观察法
B.实验法
C.调查法
D.内省法