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你能帮帮他们吗
求解答这个句子的语法,结构.It is striking that there is a divide between
1年前
如图所示.质量为m的小球A静止在光滑水平轨道上,小球A距左端竖直墙壁的距离为s.另一个质量为M=3m的小球B以速度v0沿
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the airport had built years ago 和 the airport was built year
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如图1,在正方形ABCD中,E,F,G,H分别为边AB,BC,CD,DA上的点,HA=EB=FC=GD,连接EG,FH,
1年前
Home schooling sounds easy,but it's really not
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