可以实验测定氘的结合能.The binding energy of the deuteron can be found experimentally.更为活跃的是氢的较重同位素, 氘和氚.More reactive are the heavier isotopes of hydrogen, deuterium and tritium.对于单晶,氘化的这种优点并不是必不可少的.This advisability of deuteratio...
...a magnificent collection of priceless artwork.令人叹为观止的价值连城的艺术收藏品The streets of Sao Paulo , Brazil are also rich with artwork.巴西圣包罗的街头随处可见艺术作品.This artwork is still a little dark compared to the proof.这一件艺术品与样本相比较还稍显模糊....
Barry resigned his directorship in December 1973.巴里于1973年12月辞去了他的董事之职。I felt the December air slither down my leg.我感觉到十二月的冷风沿着腿直往下钻.The ensuing December days brought to Clyde some pleasing and yet complicating and distur...
Methane and propane are alkanes.甲烷和丙烷是烷烃。Its main components include propane, butane and butylene.主要成份是丙烷 、 丁烷、丁烯等.a propane gas cylinder丙烷气钢瓶Fuel propane is scented with mercaptan odourants for leak detection.燃料丙烷通常添加硫醇...