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

【名词&注释】

添加剂(additive)、氧化铜(copper oxide)、.氧化铁

[单选题]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

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ，Ⅱ都不对

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学习资料：

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

A. flange
B. flash
C. plate
D. sheet

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

A. seal the space between the piston and the liner
B. reduce the amount of lube oil burned in the combustion chamber
C. transmit heat from the piston to the cylinder liner
D. damp out fluctuations of the piston side thrust

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