在实际管道工程中，阀门阀道的局部水头损失占管路水头损失的比例是相当大的。

Actually, in the tube engineering, the proportion of the loss of local water head in the loss of pipeline water head is big.

youdao

在实际管道工程中，阀门阀道的局部水头损失占管路水头损失的比例是相当大的。

Actually, in the tube engineering, the proportion of the loss of local water head in the loss of pipeline water head is big.

youdao