The vacuum slack flow resulted from surplus energy in large downhill section of liquid pipelines will cause water hammer oscillation cavitation vapor liquid mixture and increase the intermixture of batching transportation .

大落差 线路存在 剩余能量是产生不满流的根本原因，它可能引发水击、振动、气蚀、产生气液混合物以及增大多种液体顺序输送时的混输量等一系列问题。

Then according to the agriculture nature resources and agriculture policy the paper estimates the surplus labor force quantity in agriculture and urban industry section .

接着根据农业自然资源、生产经营方式以及农业政策等主要因素，估算了农业农业 剩余劳动力数量；根据生产函数法，估算了城市工业 部门剩余劳动力数量。