1.
A radioactive, inert, gaseous isotope of radon, with a half - life of3.92seconds.
锕射气氡的一种放射性的，惰性的和气态的同位素，其半衰期为3。92秒
2.
a radioactive element of the actinide series; found in uranium ores.
锕类的放射性元素，见于铀矿中。
3.
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium.
一种碱金属属的放射性元素，是锕瓦解的产物。
4.
a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium.
15个从锕到铹的原子量递增的放射性元素。
5.
Any of a series of chemically similar, radioactive elements with atomic numbers ranging from89(actinium)through103(lawrencium.
锕类任何化学性质相似，原子序数在89（锕）与103（铹）之间变化的放射性元素
6.
Either of two decay products of thorium, mesothorium I, an isotope of radium, or mesothorium II, an isotope of actinium.
新钍钍的两种放射性生成物之一，即新钍1号，它是镭的同位素，或新钍2号，它是锕的同位素
7.
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead.
一种存在周期短的放射性金属元素，由铀形成，能分裂成锕然后分裂成铅。
8.
THE REMOVAL OF RADIOACTIVITY FROM LANTHANUM OXIDE II.A STUDY ON THE EXTRACTION SEPARATION OF LANTHANUM AND ACTINIUM BY SOME CONVENTIONAL ORGANOPHOSPHOROUS EXTRACTANTS
氧化镧中放射性的去除——Ⅱ.几种常用有机磷萃取剂对镧和锕的萃取分离研究
9.
air jet and fluid jet
空气射流与液体射流
10.
actinide chalcogenide
锕系元素硫族元素化合物
11.
One study in 2004 estimated leatherback turtles had only a 50 percent chance of avoiding being accidentally snared by a deep sea fishing line each year.
甑囊幌钛芯抗兰疲?磕旮锕杲鲇
12.
The Reform of Waste Disposal Management in Beiping City in the 1930’s
甏?谋逼匠鞘形畚锕芾砀母
13.
European Rare-Earth Actinide Society (ERES)
欧洲稀土金属和锕元素协会
14.
The resulting radiation is known as airglow.
其发出的辐射称为气辉。
15.
Fuel gas for radiant heating;
燃料气用于辐射热；
16.
secondary air injection relief valve
二次空气喷射减压阀
17.
external air (injection) manifold
外装式空气喷射总管
18.
cell, photoemissive, vacuum or gas filled
光电发射、真空或充气管