Many of the soundings shown on the chart are derived from （）.Undue reliance should not be placed upon them．<br>A:complete and often very poor surveys<br>B:correct and often very good surveys<br>C:inadequate and often very old surveys<br>D:adequate and present surveys

Many of the soundings shown on the chart are derived from （）.Undue reliance should not be placed upon them．
A:complete and often very poor surveys
B:correct and often very good surveys
C:inadequate and often very old surveys
D:adequate and present surveys

出自：海船船员证

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