单选题Many of the soundings shown on the chart are derived from （）.Undue reliance should not be placed upon them．Acomplete and often very poor surveysBcorrect and often very good surveysCinadequate and often very old surveysDadequate and present surveys
单选题
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
参考解析
解析：
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