arbitrary proportioning meaning in Chinese

固定比例法

It was indicated from solubility determineded and phase diagram that biodiesel as fuel additive of mixture of ethanol and diesel is very good ; for biodiesel - gas - ethanol , they were mixed by arbitrary proportion , capability of gas was improved ; as for biodiesel - diesel - methanol , it is not ideal
通过溶解度测定及三相图实验数据表明生物柴油作为乙醇与柴油添加剂，促溶效果较好;对于生物柴油汽油乙醇体系来讲，三者可以任意比例混合，可改善汽油的燃烧性能；对于生物柴油柴油甲醇体系，效果不理想。