题目内容
接发球战术是与发球抢攻战术相抗衡的一项战术,其目的在于( )和( )。
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一个上旋球和一个不转球在同一高度垂直下落,反弹起来向前的远度是上旋球大于不转球,因此,上旋球越旋,其向前的反弹力越大。
TCEs have been practiced in China for several thousand years.
The chief purpose of taijiquan is to increase the amount of qi and thus improve the body's strength.
There is evidence thattaijiquan can be beneficial to the patients with heart disease.
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