房间气流组成合理,有害物源均匀地散发有害物,把这些有害物稀释到卫生标准浓度以下所需的风量称全面通风量。()
查看答案
Do you agree and disagree with the following statement?
It is difficult for teachers to be both popular (well-liked) and effective to help students learning.
Do you agree or disagree with the statement?
Playing sports can teach people lessons about life.