（）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．<br>A:Conspicuous<br>B:Permanent<br>C:Preliminary<br>D:Temporary

（）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

出自：海船船员证

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