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...
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...