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nature : at room temperature for liquid water-repellent substances known. Generally divided into : (a) vegetable oil; (2) animal oil; (3) mineral oil; (4) Essential Oil (Essential Oil). Vegetable oils and animal oil is the main component of fatty acid glyceride, also known as fat (animal fat) oil; Under normal circumstances not volatile, sometimes known as the total fixed oil (fixed oil). According to whether they were fit for human consumption can be divided into cooking oil (such as soybean oil, peanut oil, etc.) and non-oil (such as tung oil, castor oil, etc.). Mineral oil is oil, oil shale and their products, the main ingredients of hydrocarbons. A majority of volatile, distillation or fractionation, and then processing available gasoline, kerosene and lubricants. Oil is actually a special kind of vegetable oil, but their main ingredient is Terpenoid, volatile and aromatic scents, mainly for the preparation of spices. See Grease.
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