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[img]file:///C:\Users\Lee\AppData\Roaming\Tencent\Users\844291343\QQ\WinTemp\RichOle\4WJ0S3UI)KR[`NVVKK68]73.png[/img][img=0,1]file:///C:\Users\Lee\AppData\Roaming\Tencent\Users\844291343\QQ\WinTemp\RichOle\4WJ0S3UI)KR[`NVVKK68]73.png[/img]为什么面积余量这么大啊?[img=0,1]file:///C:\Users\Lee\AppData\Roaming\Tencent\Users\844291343\QQ\WinTemp\RichOle\4WJ0S3UI)KR[`NVVKK68]73.png[/img]如果减小面积余量。会不会导致传热系数的下降?
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