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单选题

Before pumping up the crankcase oil, ______ should be worked by hand to minimize corrosive action on the liners.

Athe cylinder lubricators

Bthe turning gear

Cthe starting valves

Dthe indicators

正确答案:A (备注:此答案有误)

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  • 单选题

    Before pumping up the crankcase oil, ______ should be worked by hand to minimize corrosive action on the liners.

    答案解析

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