A:110 km/h是平均速度,100 km是位移
B:110 km/h是平均速度,100 km是路程
C:110 km/h是瞬时速度,100 km是位移
D:110 km/h是瞬时速度,100 km是路程
经调查表明,人类疾病50%至80%与不良心态、恶劣情绪有关。这说明( )
—Would you mind _______ the answer on the blackboard, sir? We can't follow you.
—OK, I'll do it now.