[单选题]在船上拆下来的针阀偶件应该用()浸泡清洗。
正确答案 :B
B.煤油
[单选题]舵杆纵向裂纹应采用()修理。
正确答案 :B
焊补
[单选题]() fuel oils () lubricating oils require treatment before passing to the engine.
正确答案 :A
Both;and
[单选题]Fuel injection valves should be taken out, cleaned, and lifting checked every ().
正确答案 :B
four to six months
[单选题]“Stand by engine” means ().
正确答案 :C
make an engine ready for starting
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