同越南恢复友好关系的迹象越来越明显了。There have been growing signs of a ra-pprochement with Vietnam.越南已跃居世界第三大稻米出口国。Vietnam has emerged as the world's third-biggest rice exporter.钱也会用于越南的地方发展项目当中。Money will also go into local develop...
显然磁导率不是常数.It is evident that the permeability is not a constant.幸而, 目下已有兼备高磁导率和低磁导率损耗的铁和铁合金,可资利用.Fortunately, iron or iron alloys are available which combine high permeability with small hysteresis loss.因此, 通过测量磁导率, 残余应力...