The inviscid linear stability of variable density swirling jets is analyzed by normal mode method.用正则模方法研究了变密度无粘旋拧射流线性稳定性特征.And accoutrements of rhythmic gymnastics - the hoop, the swirling ribbon - divert from the balle...
This paper introduces a rarely seen method of describing with diametral distance.本文介绍了一种鲜为人知的用直径距离描绘椭圆的方法.Meshing spur gears must have the same diametral pitch.互相啮合的直齿圆柱齿轮,必须具有相同的径节.Diametral pitch : the number of teeth ...
Widespread epidemics in birds increase opportunities for human exposure.禽类中的广泛流行增加了人类暴露的机会.The epidemics usually stop when the summer rainy season begins.时疫通常在夏季雨季开始时停止传播....the protection of mankind against the forces o...