[单选题]废气锅炉小的烟垢着火,对锅炉危害(),在一定条件下可发展为(),导致废气锅炉()。
正确答案 :A
不大/高温着火/损坏
[单选题]Compressed air is used on board ship ().
正确答案 :D
All the above are true
[单选题]The crankshaft of diesel engine is supported by ().
正确答案 :D
main bearing
[单选题]Excessive vibration of an automatically fired auxiliary boiler can be caused by ()
正确答案 :B
combustion pulses
[单选题]A diesel engine piston ring face is in direct contact with the ().
正确答案 :B
cylinder liner oil film
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