另外，对断面密度分布与板子强度之间的关系、复合定向刨花板结构也作了研究。
The relationship between the density gradient and the strength of OSCP, and the structure of OSCP are also discussed.
水下定向爆破可以通过减少抛掷方向的介质密度、形成定向坑，利用定向聚能药包及延期爆破等方法实现。
Underwater directional blasting can be achieved through the methods of reduced density of medium in thrown direction, formed directional pit, directional comulative blasting, delayed blasting etc.
该制备方法简单易行，所制备的碳纳米管阵列密度高且均匀地定向排列。
The preparation method is simple for practice, and the prepared carbon nanotube array has high density and is evenly and directionally arranged.
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