A.raise the boom
B.raise the hook
C.raise the boom and hook
D.check the boom stop
第1题
A.Exclusion of all sand and solid matter
B.Cleaning with clean fresh or sea water
C.Examination for fractures and pitting
D.All of the above
第2题
A.Common carrier
B.Tramp
C.Public vessel
D.Bulk carrier
第3题
A.Soluble state
B.Solid state
C.Liquefied state
D.Inert state
第4题
A.Vaporizes
B.Attacks caustically
C.Rises
D.Attacks corrosively
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