问题描述：
9题怎么做求解答😊😊
问题解答：
我来补答
体积V=25*12.5*1.2=375m³
管截面S=
*（D/2）²=3.14*100=314cm²=0.0314m²
时间t=375/(0.0314*100)=119min
管截面S=
*（D/2）²=3.14*100=314cm²=0.0314m²时间t=375/(0.0314*100)=119min
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