【简答题】We also contrastedworkers with non-workers, on different indicators of their c_________ 投入 toeducation.
【简答题】2回答下列问题,并作解释: (1) 作用于质点的力不为零,质点所受的力矩是否也总不为零? (2) 作用于质点系的外力矢量和为零,是否外力矩之和也为零? (3) 质点的角动量不为零,作用于该质点上的力是否可能为零?
【判断题】检查经纬仪光学对中器视准轴与竖轴的同轴度时,将仪器精确整平。
【单选题】We also contrasted workers with non-workers, on different _______ of their commitment to education.
【判断题】作用于质点系的外力矢量和为零,外力矩之和不一定为零。()
【单选题】听力原文:M: Are we short of tea and coffee? W: Oh, yes. And we also need some vegetables, too. It's the next item on the list. Q: What do they not need to buy? (3)