A:E′=E,方向与E相反
B:E′=E,方向与E相同
C:E′=E/2,方向与E相反
D:E′=2E,方向与E相同
(report报告;umbrella雨伞)
Cities
Weather
Beijing
It's sunny, but it will be ____ in the afternoon.
Qingdao
The weather is fine and ____.
Harbin
It's snowy and ____.
Xi'an
It's sunny and warm.
Guangzhou
It's ____ and ____
能够说明力的作用是相互的物理道理的事实是( )