单选题prolonged blast()A短声B短笛C长笛D长声

单选题
prolonged blast()
A

短声

B

短笛

C

长笛

D

长声


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You are on international waters during a heavy rainstorm and hear a vessel sounding a fog signal of one prolonged blast followed by two short blasts. Which of the following could it be?Ⅰ.A vessel laying submarine cable making way.Ⅱ.A pilot vessel on station at anchor.A.Ⅰ onlyB.Ⅱ onlyC.Either Ⅰ or ⅡD.Neither Ⅰ nor Ⅱ

On the high seas,a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a ______.A.vessel being towedB.fishing vessel engaged in trawlingC.vessel at anchor warning you of her locationD.power-driven pilot vessel on station underway

A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound ______.A.a 2-second blast every 20 secondsB.a 4-second blast every 20 secondsC.an 8-second blast every 30 secondsD.a 10-second blast every 30 seconds

迟发延续反应(delayed prolonged response)

prolonged blast()A、短声B、短笛C、长笛D、长声

Second Officer, give one ()(长声).A、blastB、short blastC、prolonged blastD、prolonged blasts

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名词解释题BLAST

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问答题相比使用BLAST套件搜索数据库,BLAST2工具在结果呈现上有什么优点?

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