20.某幢建�物从10米高的窗口a用水管和�外喷水喷的水流�抛物线抛物线所在平面与墙面垂直如果抛物线的最高点m离墙1米离地面米则 Template




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tomski20.某幢建�物从10米高的窗口a用水管和�外喷水喷的水流�抛物线抛物线所在平面与墙面垂直如果抛物线的最高点m离墙1米离地面米则 coloring