问题描述：
[单选]
Friction， engine wear and oil consumption in a diesel engine are directly related to the（）．
A．acidity of the oil
B．pour point of the oil
C．flash point of the oil
D．viscosity of the oil
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答案解析：无
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上一篇：The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to（）．
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