[单选题]低速柴油机的最低稳定转速不高于标定转速的（）%。

正确答案 ：B

30

[单选题]吊缸发现燃烧室零件表面有水锈时，表明（）产生穿透性裂纹。

正确答案 ：D

气缸或活塞

[单选题]This used piston had been tested and approved as a spare part by the （） during last annual repair.

正确答案 ：C

surveyor

[单选题]When the fuel oil is burning in the combustion chamber, it （）.

正确答案 ：B

gives off large amount of heat

[单选题]The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.

正确答案 ：D

maintain specified injection characteristic

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