第2题
C inspection ?
第3题
as your position during bunkering on your last vessel ?
第7题
ity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .
第9题
活塞顶面烧蚀的最大烧蚀厚度达顶部设计厚的_______时应换新
A.1/2
B.1/3
C.1/4
D.1/5
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