Where is the school?
A:It's behind the bank.
B:It's next to the bank.
C:It's in front of the bank.
如图所示的电路中电源电压保持不变,闭合开关,当滑片P向左滑动时,电压表的示数____ (选填“变大”、“变小”或“不变”),灯泡的亮度____ (选填“变亮”、“变暗”或“不变”).
下列物理量中属于标量的是( )
—It's great. If we follow it, we can finish the task in a short time.