相关词条
+氦也
1 . helium is also
helium is alsolighter than air , but it costs a lot of money . so balloons were ( and are ) usually filled with hydrogen .氦也比空气轻,但价格昂贵,因此气球过去(现在也一样)通常都装氢气。
+氦的
1 . of helium
a fountain of heliumspurt out of the tube .有一股氦的喷泉从小管中喷出。
2 . helium ’ s
for instance , at low temperatures liquid helium ’ sproperties change dramatically , becoming a “ superfluid ” that can overcome friction .比如,在低温时,液态氦的性质产生剧烈变化,成为一种能克服摩擦“超流体”。
+氦从
1 . helium out
Never pour liquid helium outof the container ., 禁止把液氦从容器中倾倒出来.
+氦液化器
1 . helium liquefier
helium liquefaction 氦液化helium liquefier氦液化器helium neon laser 氦氖激光器