... 质点 mass point; material particl ... 基元质量 element mass 单元质量矩阵 element mass matrix ...
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element mass matrix 单元质量矩阵
element mass conservation 元素质量守恒
inert element mass balance 惰性离子质量平衡
finite element mass lumping 有限元集中质量法
element rock mass 单元岩体
mass element 质点单元
rock mass element 岩体单元
Concrete mass element 混凝土块单元
Just five years later an element with the proper atomic mass was isolated and named gallium by its discoverer.
仅仅5年后，一种具有适当原子质量的元素被分离出来，并被发现者命名为镓。
In fact, 24 per cent of our galaxy elemental mass consists of helium, which makes it the second most abundant element in our universe.
事实上，银河系中24%的元素质量是由氦组成的，这使它成为宇宙中第二丰富的元素。
Mendeleyev was bolder than Meyer and even assumed that if a measured atomic mass put an element in the wrong place in the table, the atomic mass was wrong.
门捷列夫比迈耶更大胆，他甚至认为，如果测量到的原子质量在表中把一个元素对应于错误的位置，这个原子质量就是错误的。
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