正确答案: D

以上均可

题目：当气阀阀面出现麻点、腐蚀时可采用（）工艺修复。

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学习资料的答案和解析：

[单选题]双轴系具有高速、（）和（）的特点。

机动性好/生命力强

[单选题]The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.

lubricating oil

[单选题]The development of （） has kept pace with the increasing demands made by the steady rise in power produced by modem marine diesels.

oils

[单选题]The operation between two fuel injections is called a （）.

working cycle

[单选题]With （） unit the timing of fuel injection of an engine can be regulated automatically.

VIT

[单选题]The trouble-free life of an engine indicates （）.

the period of time during which no trouble occurs to the engine