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
更多“Many of the soundings shown on the chart are derived from （）.Undue reliance should not be placed upon them．”相关的问题
A、pass through The Race B、cross the territorial sea boundary C、exit Block Island Sound to the east or south D、None of the above，as Long Island Sound is governed by the International Rules of the Road
A、Give the description of the following sound segments in English. B、[k];[z];[w];[u:];[i]
A、vertical distance from the chart sounding datum to the ocean bottom，plus the height of tide B、vertical distance from the chart sounding datum to the ocean bottom C、average height of water over a specified period of time D、average height of all low waters at a place
A、A.When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signal B、B.Only the stand-on vessel can sound the danger signal C、C.Distress signals may be used in place of the danger signal D、D.The danger signal consists of 4 or more short blasts of the whistle
A、reduce the time the sounding tube is open B、avoid creating a spark C、lessen the effect of roll or pitch on the reading D、lessen the effect of heave on the reading
A、Sound one blast of the whistle B、Alter course to starboard C、Construct a radar plot D、Sound the danger signal
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