单选题()objects are those which stand out clearly from the background or other objects and are easily identifiable from a few miles offshore in normal visibility.AConspicuousBPermanentCPreliminaryDTemporary

单选题
()objects are those which stand out clearly from the background or other objects and are easily identifiable from a few miles offshore in normal visibility.
A

Conspicuous

B

Permanent

C

Preliminary

D

Temporary


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