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问题详情

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 seconds

B、a 4-second blast every 20 seconds

C、an 8-second blast every 30 seconds

D、a 10-second blast every 30 second

时间：2022-01-03 19:03 关键词：各种英文申请书

答案解析

A

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