the introduction of pingpang
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the introduction of pingpang
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the introduction of pingpang
乒乓球(运动)的介绍
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Indoor game played on a rectangular table by two or four players. It was developed in Britain in about 1880 and derived from lawn tennis. World championships were first held in 1926.
Play takes place on a table measuring 2.74 m/9 ft long by 1.52 m/5 ft wide, lying flat 2.5 ft/0.76 m above the ground. Across the middle is a 15.25-cm/6-in-high net over which the ball must be hit. The players use small, wooden paddles covered in sponge or rubber. A feature of the game is the amount of spin put on the small plastic ball. Volleying is not allowed. Points are scored by forcing the opponent(s) into an error. The first to score 21 wins the game. A match consists of the best of any odd number of games. In doubles play, the players must hit the ball in strict rotation.
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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