问题描述：
[单选]
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 impuritie
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答案解析：无
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下一篇：Impurities in the fuel oil will affect the operation of the engine， which has（）the use of separator and some other devices．
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