In order to possess these excellent characters, nano-ceramic particles must satisfy high purity, well-distributed chemical component, proper granule size and narrower distribution.
为了使纳米陶瓷具有优良的性能，必须要有高纯度、化学组成均匀、颗粒大小能满足要求且粒度分布较窄的纳米陶瓷粉体作为原料。
The experimental method used to form doughnut laser trap through axicons and by extracting high order diffractive light component is introduced.
介绍了用锥镜法和取高级衍射光斑法来实现空心光阱的实验方法。
Some measures are taken during the observation in order to ensure to obtain the high precise height component.
在观测中采取了一定的措施，以获得高精度的高程分量。
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