Enough sleep is good for health. If you for your favorite games, you will be exhausted the next day.
A:stay up
B:show up
C:give up
要减轻如图漫画中出现的环境问题,我们应该( )
如图示电路中,电源电动势为E,内阻为r,R1、R2为定值电阻,R3为可变电阻,C为电容器.在可变电阻值R3由较大逐渐变小的过程中( )
——Do you know Shenzhou X is flying in space?—— exciting news!