helium atmosphere信息详情
氦气保护
atmosphere───n.气氛;大气;空气
helium───n.[化学]氦(符号为He,2号元素)
superabundant atmosphere───大气过剩
enliven atmosphere───活跃气氛
chorded helium───弦氦
helium space───氦空间
helium balloon───氦气球
atmosphere pressure───大气压力,大气压强
oxidizing atmosphere───[冶]氧化气氛;权化气氛
The particles are generally protons , electrons and helium nuclei and when they collide with nuclei in the Earth's upper atmosphere they can produce shower s of daughter particles.───这些粒子主要是质子、电子和氦原子核,并且当他们与地球高层大气中的原子核碰撞,就能产生次级粒子簇射。
Measurements can be performed in a vacuum or helium atmosphere.───测量可在真空或氦气氛中进行。
In general, the heavier atoms in the atmosphere sink and the light ones remain at the surface, which is why some white dwarfs, for example, have mostly pure hydrogen or helium atmospheres.───总体来说,较重的原子在大气圈中沉积,而较轻的原子则存在于大气圈表面,这也是一些白矮星具有较纯净的氢和氦大气圈的原因。
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