Dall流量管是具有特别高的压头补偿的实验装置.The Dall flow tube is an empirical design with an extremely high pressure head recovery.当下游压头大于上游压头约3/5时, 流量是潜流.When the downstream head is greater than about 3 / 5 of the upstream head, flow is s...
Climate reflects a basic struggle between constancy and change.气候反映出稳定与变化之间基本的较量。He admired her courage and constancy.他钦佩她的勇气和忠贞。The constancy of the speed of light seems, at first thought, unremarkable.光速恒定, 初看起来好像很平常....