A:电流表的示数增大
B:电流表的示数增大
C:电流表的示数减小
D:三个电表的示数都不变
This summer vocation I am going to do a lot of _________ to prepare for the senior high school.
— Why is your bedroom so dirty?— Sorry, Mum. It ___________. I felt very tired after playing soccer.
He is taking ______ now.
下列物理量中,属于标量的是( )
如图所示:甲、乙分别是“探究平面镜成像特点”和“探究凸透镜成像规律”的实验装置.