物理！！！急需啊~~~~
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D
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答案：（1）平衡力 大于 不一定相同 （2）大于 小于
1
小于、不一定相同
2
大于、小于。
参考“伯努利方程”：p+ρgz+(1/2)*ρv^2=C（流速大处压强小）http://baike.baidu.com/view/94269.htm
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