The reasons for price of acrylic acid being rapidly increasing are narrated, i. e. price increasing of petroleum in international market and implementation of anti-dumping twice at home.

分析了国内丙烯酸及丙烯酸酯价格飚升的原因：国际石油价格的上涨以及国内两次实施的反倾销措施。

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It's very important for some petroleum machinery(e. g. drilling rig and pumping unit) to carry on reliability analysis and design of the system of the narrow V type belt drive.

开展窄V带传动系统可靠性分析与设计对于提高钻机、抽油机等石油钻采机械的质量和效益具有重要意义。

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The work took cutting machine use raw materials for inflammable gas e. g. acetylene, propane, gas, such as liquefied petroleum gas (LPG).

切割机使用的工作原料为易燃性气体如乙炔、丙烷、液化气等气体。

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