正确答案: B

仅Ⅱ对

题目：使用含有（）的燃油添加剂，可使烟灰失去粘性，导致烟灰沉积趋势的减少。Ⅰ.氧化铜；Ⅱ.氧化铁

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学习资料的答案和解析：

[单选题]The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.

flash

[单选题]The main purpose of the piston oil scraper rings is to （）.

reduce the amount of lube oil burned in the combustion chamber