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...
They will concentrate on teaching the basics of reading, writing and arithmetic.他们将集中教授阅读、写作和算术基础知识。We must concentrate our energies on treating addiction first.我们必须首先集中精力治疗毒瘾。A term in prison will concentrate his mind w...
They believed ancient Greece and Rome were vital sources of learning.他们认为古代希腊罗马是知识的重要发源地。They are both very vital people and a good match.他俩都很有活力，十分般配。These projects will provide vital links between companies and univers...