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

单选题
2022-01-03 19:03
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
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正确答案
A

试题解析

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