Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．<br>A:concealed<br>B:buried<br>C:existed<br>D:built

Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
A:concealed
B:buried
C:existed
D:built

出自：海船船员证

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