对玫瑰精油制备方法进行了综述。按照化学物种类归纳了国产玫瑰精油的化学成分并对其香气特征进行了分析。
Then, according to chemical kinds, components and their aromatic characteristics of rose essential oil produced in China were summed up.
对熔炼室真空度、聚焦、原料棒化学成分、尺寸规格、熔炼速度，搅拌速度等对单品制备的影响进行了详细分析。
Influences of vacuum in the melting chamber, chemical composition and specifications of Mo and Mo-Nb alloy feed stock bar growing rate, rotation rate on processing Mo-Nb alloy are analyzed in detail.
主要讨论了钼-铌合金原料品质，包括烧结条的制备、原料的化学成分、原料棒的尺寸规格等对单晶制备的影响。
Influence of feedstock qualities of Mo-Nb alloy, including its preparation of sintering billet, chemical composition and specifications, on processing single crystal is discussed in detail.
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