system oil大型船用十字头柴油机轴承润滑油systemn.系统；体系；身体；制度system of artificial immunity人工免疫系统SYSTEM Data Collection System数据收集系统system of political democracy政治民主制度systematized sales management系统化售货管理system of labour remuneration劳动报酬制度system level gray correlation系统层次灰关联分析system of government employee政府雇员制度system electric power density系统输出电能密度system engineering capability系统工程能力system of parabolic equations抛物型方程组