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:2022-11-06 08:44:54 所属题库:各种英文申请书题库

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