单选题The emulsion of the oil is mainly caused by （）.Athe solid impurities of large particleBthe solid impurities of fine particleCthe water contentDboth water and solid impurities
单选题
The emulsion of the oil is mainly caused by （）.
A
the solid impurities of large particle
B
the solid impurities of fine particle
C
the water content
D
both water and solid impurities
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解析：
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