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- 1如图所示,在光滑的圆锥顶用长为L的细线悬挂一质量为m的小球,圆锥顶角为2θ,当圆锥和球一起以角速度ω匀速转动时,球压紧锥面. (1)此时绳的张力是多少? (2)若要小球离开锥面
- 2There is a car in the park.用a car提问
- 3化简a-[4a-2(a-2b)]
- 4怎样画杠杆的力臂 (举一些比较难的例子)
- 5We'better stay at home since it_____(rain) heavily outside.
- 61.照例子写词语 2.照样子写出3个意思相同或相近的词(要求:按我的格式写!)
- 7用1、2、3、4、5这五个数字组成一些一位小数,把这些数按从小到大的顺序排列,第98
- 8一道有点难的化学题.
- 9How do you say it was good to see someone?
- 10He is tall and he _____big eyes.填has 还是with?