helium是什么意思

helium是什么意思? helium是什么意思 请问 HIGH PURITY HELIUM Helium 氦的做用是什么, 为什么门捷列夫的第一张元素周期表没有 Helium Neon Argon 求助helium gas recovery machine‏ 此机器的准确中文名.产品在下面 所有元素英语全名前面常见的元素全部写一下英语全称,eg Hydrogen氢 Helium氦 英语翻译The light elements were formed by nuclear reaction in stars formed from primeval hydrogen and helium这里的 “in 英语翻译It so happens that more massive stars have lower surface temperatures at this stage,but all stars have roughly the same luminosity after the helium flash. 谁能帮忙翻译下这几句英语的大体意思,不要用翻译器翻译,是机械专业英语!1.Leak check with helium,total leak rate 英语翻译The early universe contained only the lightest elements,hydrogen and helium.Heavier elements,such as carbon,form only in nuclear reactions in stars and are dispersed when the stars explode.A recently discovered gas cloud contained carbon 英语翻译They call you smokey tabooI got your name tatooedHigh like a helium balloon Midnight to noon I'm a desert childAnd nuns make me nauseousI like to look up wildAt an infinite skyTwinkling with diamondsIt's trueI get depressed in fancy hotel 什么元素原本就是共价键分子?which of the following elements exists naturally as a covalently bonded molecule?A.gold B.helium C.sodium D.bromine正确答案是D.bromine,也就是Br……但是为什么啊?怎么区分?我查到的更多有 相对论部分 1.The total power radiated by the sun is about 3.83 x1026 Watts.How many kilograms of protons and electrons are transformed into helium every second?Note:For a fusion reaction the fraction of mass converted to energy is about 0.007.2. 相对论问题,等价原理如果一氦气被填装的轻快优雅在加速在起飞的跑道下的飞机的客舱被发布,气球将漂浮朝着客舱的前面.等价原理怎么解释这为什么发生?If a helium-filled ballon is released in the 英语翻译By the water,there is a small pink dot of a helium balloon,bobbing in the intermittent breeze.The balloon is key.It was given to you by Pink Flamingo,a pizza parlor down the nearby Rue Bichat,whose bicycle deliveryman will use it as a bea 是什么意思 是什么意思?