The datum from which the predicted heights of tides are reckoned in the tide tables is ______.A.mean low waterB.the same as that used for the charts of the localityC.the highest possible levelD.given in table three of the tide tables
The datum from which the predicted heights of tides are reckoned in the tide tables is ______.
A.mean low water
B.the same as that used for the charts of the locality
C.the highest possible level
D.given in table three of the tide tables
相关考题：
The distance between the surface of the water and the tidal datum is the______．A.height of tideB.charted depthC.actual water depthD.range of tide
In which case would you use a FULL OUTER JOIN? () A. Both tables have NULL values.B. You want all unmatched data from one table.C. You want all matched data from both tables.D. You want all unmatched data from both tables.E. One of the tables has more data than the other.F. You want all matched and unmatched data from only one table.
In which of the following situations should correlation names be used?() A.A table referenced in the FROM clause has no indexed column.B.The table referenced in the FROM clause has more than 200 columns.C.Two or more tables in the FROM clause have identical column names.D.The FROM clause contains two or more tables in the SELECT statement.
The meaning of ebb tide is that ______.A.tide is falling from high water to low waterB.tide is rising from low water to high waterC.tide is reaching to a highest levelD.tide is reaching to a lowest level
From ______ the mariner can know the data of tide．A.the Sea PilotB.the Cargo PlanC.the Tide TableD.the Port List
Charted depth is the ______.A.vertical distance from the chart sounding datum to the ocean bottom，plus the height of tideB.vertical distance from the chart sounding datum to the ocean bottomC.average height of water over a specified period of timeD.average height of all low waters at a place
Charted depth is the ______.A.vertical distance from the tidal datum to the ocean bottom plus the height of the tideB.vertical distance from the tidal datum to the ocean bottomC.average height of water over a specified period of timeD.average height of all low waters at a place
The reference datum used in determining the heights of land features on most charts is ______.A.mean sea levelB.mean high waterC.mean low waterD.half-tide level
______ gives daily predictions of the times and heights of high and low waters for over 230 standard and 6，000 secondary ports in the world.A.Admiralty Tide TablesB.Admiralty Tidal Stream AtlasesC.Admiralty Manual of Tides（NP120）D.Admiralty Tidal Handbooks（NP122 1-3）
To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is ______．A.the actual depthB.added to or subtracted from the charted depthC.multiplied by the charted depthD.divided by the charted depth
Admiralty Easy Tide ______．A.has little use for ocean-going marinersB.permits the mariner to select and simultaneously calculate tidal heights for multiple ports for up to seven daysC.includes periods of daylight and nautical twilight，moon phases and a springs and neaps indicatorD.is supplied in the form of a single CD which contains the calculation program and the seven geographic Area Data Sets（ADS）providing global coverage
Which two statements are true regarding the USING clause in table joins?（）A、It can be used to join a maximum of three tables B、It can be used to restrict the number of columns used in a NATURAL join C、It can be used to access data from tables through equijoins as well as nonequijoins D、It can be used to join tables that have columns with the same name and compatible data types
In which of the following situations should correlation names be used?（）A、A table referenced in the FROM clause has no indexed column.B、The table referenced in the FROM clause has more than 200 columns.C、Two or more tables in the FROM clause have identical column names.D、The FROM clause contains two or more tables in the SELECT statement.
单选题The reference datum used in determining the heights of land features on most charts is（）.Amean sea levelBmean high waterCmean low waterDhalf-tide level
单选题The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.AAdmiralty Maritime CommunicationsBAdmiralty Tide TablesCa comprehensive guide for the yachtsmanDALRS
单选题（）gives daily predictions of the times and heights of high and low waters for over 230 standard and 6，000 secondary ports in the world.AAdmiralty Tide TablesBAdmiralty Tidal Stream AtlasesCAdmiralty Manual of TidesDAdmiralty Tidal Handbooks
单选题Rising tides of unemployment claims across the state has led the governor to declare the economy to be in a state of emergency.ARising tidesBBecause the rising tideCThe tide is risingDThe rising tideEThe rising of the tide
单选题When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.ADiurnaBSemi-diurnalCSolarDMixed
单选题The difference between the heights of low and high tide is the（）.AperiodBrangeCdistanceDdepth
单选题To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is（）.Athe actual depthBadded to or subtracted from the charted depthCmultiplied by the charted depthDdivided by the charted depth
单选题A tide is called diurnal when（）.Aonly one high and one low water occur during a lunar dayBthe high tide is higher and the low tide is lower than usualCthe high tide and low tide are exactly six hours apartDtwo high tides occur during a lunar day
单选题Which statement is TRUE concerning apogean tides（）．AThey occur only at quadratureBThey occur when the Moon is nearest the EarthCThey cause diurnal tides to become mixedDThey have a decreased range from normal
单选题In which case would you use a FULL OUTER JOIN? （）ABoth tables have NULL values.BYou want all unmatched data from one table.CYou want all matched data from both tables.DYou want all unmatched data from both tables.EOne of the tables has more data than the other.FYou want all matched and unmatched data from only one table.
单选题In which of the following situations should correlation names be used?（）AA table referenced in the FROM clause has no indexed column.BThe table referenced in the FROM clause has more than 200 columns.CTwo or more tables in the FROM clause have identical column names.DThe FROM clause contains two or more tables in the SELECT statement.
单选题The datum from which the predicted heights of tides are reckoned in the tide tables is（）.Amean low waterBthe same as that used for the charts of the localityCthe highest possible levelDgiven in table three of the tide tables
单选题Charted depth is the（）.Avertical distance from the tidal datum to the ocean bottom plus the height of the tideBvertical distance from the tidal datum to the ocean bottomCaverage height of water over a specified period of timeDaverage height of all low waters at a place
单选题Charted depth is the （）.Avertical distance from the chart sounding datum to the ocean bottom，plus the height of tideBvertical distance from the chart sounding datum to the ocean bottomCaverage height of water over a specified period of timeDaverage height of all low waters at a place