题目内容
______is the speed of a vessel allowing time for effective action to be taken under prevailing circumstances and conditions to avoid a collision and to be stopped within an appropriate distance．
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长期待摊费用是指企业已经发生的但应由本期和以后各期负担的、分摊期限在一年以上的各项费用，所以属于企业的费用。()
______20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions(捕获) are possible．
______the survivors know more of how to cope with cold water in the sinking of MV Titanic
______should be used during the poor visibility if the rader’s screen shows heavy sea returns.
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