题目内容

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.

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建筑排水系统的通气管主要是用来排气的。()

金属卤化物灯属于热辐射光源的一种。()

Do you agree or disagree with the statement？
Playing sports can teach people lessons about life.

自然循环热水供暖系统是靠水的密度差形成压力差的使水在系统中循环的。()