A:①③
B:①④
C:②③
D:②④
下列是人体健康的有关问题,错误的是( )
A woman____ ____ by a self-driving car as she walked her bicycle across a street.
化学反应进行的快慢常用“化学反应速率”这一物理量来描述,关于化学反应速率的理解正确的是( )