减少误差的首要问题是（）。
A.恰当地确定样本的数目
B.合理抽取调查样本
C.加强抽样调查组织工作，提高工作质量
D.增加费用开支
参考答案：B
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
测定汽油辛烷值时，规定抗爆性极差的（）辛烷值为0。
A.正庚烷
B.环已烷
C.环氧乙烷
D.异辛烷
