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。
2
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。
3
The gravity change process associated with the earthquake preparation is increasing, accelerated increasing and decelerated increasing followed by the occurrence of the earthquake.