Mr. Lee suggested that all of us go out to have a walk to refresh our mind ________ classes.
A:among
B:during
C:without
D:between
关于功是否为矢量,下列说法正确的是( )
某同学在做“用电压表和电流表测灯泡的电阻”实验时,连接电路如图所示.请指出他的接线中的错误,应如何纠正?