The value of oil absorption, viscosity of Nujol mull, specific surface area, contact angle, distribution of particle size and dispersivity of the calcium carbonate particles were also characterized.
对改性前后碳酸钙粉体

角、吸油率、石蜡糊粘度、粒度分布、分散性等性能进行了比较。
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5月合集 

级听力真题精听
12月合集
日英语听力 | 双语精读
8月合集 Partners at Y Combinator, a startup accelerator, encourage founders to apply to their programmes by talking about increasing the " surface area of luck" : putting yourself in situations where you may be rejected is a way of giving luck more opportunity to strike.
创业孵化公司Y Combinator的合伙人们鼓励创业者申请他们的项目,话术是可以增加“幸运表面积”:把自己置于可能被拒绝的情况下,可以增加好运降临的几率。