The irregular black line around a charted light such as Race Rock Light indicates that it is （）.<br>A:unwatched<br>B:surrounded by riprap<br>C:a minor light<br>D:constructed on an artificial island

The irregular black line around a charted light such as Race Rock Light indicates that it is （）.
A:unwatched
B:surrounded by riprap
C:a minor light
D:constructed on an artificial island

出自：海船船员证

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