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A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound().

发布日期:2021-03-22

A jack-up drilling unit elevated on the Outer Cont...
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 seconds

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