It is hopeful to enhance the capability and urge the application of the high specific gravity tungsten based alloy of block materials by using nano preparation technology.
采用纳米技术制备高比重钨合金块体材料有望进一步提高其性能，促使其应用。
Preparation of activated carbon from vitrinite and inertinite concentrated from Datong bituminous coal with specific gravity has been studied.
用密度法分离富集了大同烟煤镜质组和惰质组，研究了大同烟煤镜质组和惰质组制备活性炭性能。
The gravity change process associated with the earthquake preparation is increasing, accelerated increasing and decelerated increasing followed by the occurrence of the earthquake.
与地震孕育相关重力场变化总体呈增大—加速增大—减速增大—发震的过程；
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