正确答案: A

仅Ⅰ对

题目：应保持锅炉管表面边界层的废气温度（）烟灰着火温度，减少烟垢着火的危险。Ⅰ.低于；Ⅱ.等于；Ⅲ.高于

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学习资料的答案和解析：

[单选题]柴油机备车工作包括（）。Ⅰ.校对时钟与舵机；Ⅱ.暖机与各系统准备；Ⅲ.开启舱底应急吸口阀；Ⅳ.转车、冲车与试车

Ⅰ＋Ⅱ＋Ⅳ

[单选题]In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.

obtain complete burning

[单选题]In each cylinder cover there are two or three holes for （）

the fuel valves

[单选题]In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.

detergency