对会议的评估应做到（）。
A．淡化宣传
B．避免定论
C．科学高效
D．澄清事实
参考答案：C
More than two _______years ago, people knew little about the universe.
A．thousands
B．thousand
C．thousands of
D．thousand of
装配图的尺寸标准和技术要求
