A、<p style="line-height: 150%;"><span style="font-size:16px;line-height:150%;font-family:'Times New Roman','serif'">2</span><span style="font-size:16px;line-height:150%">管高于</span><span style="font-size:16px;line-height:150%;font-family:'Times New Roman','serif'">1</span><span style="font-size:16px;line-height:150%">管</span><span style="font-size:16px;line-height:150%;font-family:'Times New Roman','serif'"> </span>
B、<p style="line-height: 150%;"><span style="font-size:16px;line-height:150%;font-family:'Times New Roman','serif'">1</span><span style="font-size:16px;line-height:150%">管高于</span><span style="font-size:16px;line-height:150%;font-family:'Times New Roman','serif'">2</span><span style="font-size:16px;line-height:150%">管</span><span style="font-size:16px;line-height:150%;font-family:'Times New Roman','serif'"> </span>
C、<p style="line-height: 150%;"><span style="line-height: 150%; font-family: 'Times New Roman', serif;">1</span><span style="line-height: 150%;">和</span><span style="line-height: 150%; font-family: 'Times New Roman', serif;">2</span><span style="line-height: 150%;">两管同高</span><span style="line-height: 150%; font-family: 'Times New Roman', serif;"> </span>
D、<p style="line-height:150%"><span style="line-height: 150%;">无法确定</span><br/></p><p><br/></p>
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