單項(xiàng)選擇題The ship should be operated by a company which is issued a(an)（）relevant to ship.
A.ISM
B.DOC
C.SMC
D.PSC
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1.單項(xiàng)選擇題Christopher Columbus （） eighteen years （） planning for that wonderful voyage which he made across the Atlantic Ocean.
A.spends；in
B.spent；on
C.has spent；on
D.had spent；in
2.單項(xiàng)選擇題Water can’t be used to put out fires of （）
A.Class A
B.Class B
C.Class C
D.B+C
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