A1秒
B2秒
C3秒
D4秒
汽笛短声历时()。
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汽笛长声“—”历时:()
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在狭水道或航道听道两长一短声的汽笛声,这是()。
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()fore and aft decks and prepare for sea.
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Rig the lifeboat ladder and safety net and report.()
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Put on ()(艇底塞) and hand the fender and the buoy.
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()are for radiators and pipes and for the ship’s funnel.
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Put in boat plug and hand the fender and the puoy.()
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()(耐热漆) are for radiators and pipes and for the ship’s funnel.
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