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问题详情

You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）

A、Dead in the water

B、1 knot

C、10 knots

D、15 knot

时间：2022-01-04 17:21 关键词：雷达及ARPA的使用

答案解析

D

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