正确答案: D
Ⅰ+Ⅱ+Ⅲ
题目:劣质渣油中含有(),使用中使烟灰增加且具有粘性,是烟灰发生沉积的重要原因()。Ⅰ.灰分;Ⅱ.残炭;Ⅲ.硫分
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[单选题]() for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.
The drive
[单选题]Please supply my vessel()120 tons of diesel oil.
with