A mobile offshore drilling unit will show the day-shape in DIAGRAM 10 to indicate that it is （）.<br>A:at anchor<br>B:being towed<br>C:aground<br>D:drilling

A mobile offshore drilling unit will show the day-shape in DIAGRAM 10 to indicate that it is （）.
A:at anchor
B:being towed
C:aground
D:drilling

出自：海船船员证

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