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4、发球时，球垂直向上抛起，高度应不低于 厘米。 For a legal serve, the ball should be thrown up vertically, and the height should not be less than cm.
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更多 “4、发球时，球垂直向上抛起，高度应不低于 厘米。 For a legal serve, the ball should be thrown up vertically, and the height should not be less than cm.” 相关考题
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