All echo-sounders can measure the ______．A.Actual depth of waterB.Actual depth of water below keelC.Average depth from waterline to hard bottomD.Average depth of water to soft bottom
All echo-sounders can measure the ______．
A.Actual depth of water
B.Actual depth of water below keel
C.Average depth from waterline to hard bottom
D.Average depth of water to soft bottom
相关考题：
25． Which of the following is WRONG?A． One animal finds something to eat， and it may be eaten by othersB． At the depth of 3，000 feet under the sea， many animals can find their way by hearing and feeling．C． The deeper the sea is， the darker and colder it is．D． At the depth of 3，000 feet under the sea， all animals can find their way by see-ing．
Can you measure oil level? Which method is right, to measure ullage height or to measure oil depth?
The distance between the surface of the water and the tidal datum is the ______.A.range of tideB.height of tideC.charted depthD.actual water depth
The height of tide is the ______.A.depth of water at a specific time due to tidal effectB.difference between the depth of the water and the area's tidal datumC.difference between the depth of the water and the high water tidal levelD.difference between the depth of the water at high tide and the depth of the water at low tide
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
The recording fathometer produces a graphic record of the ______．A.bottom contour only up to depths of 100 fathomsB.depth underneath the keel against a time baseC.contour of the bottom against a distance baseD.depth of water against a distance base
You are anchoring in 16 fathoms of water．On a small to medium size vessel，the ______．A.Anchor may be dropped from the hawse pipeB.Anchor should be lowered to within 2 fathoms of the bottom before being droppedC.Scope should always be at least ten times the depth of the waterD.Scope should always be less than 5 times the depth of the water
Air gap is the vertical distance between the bottom of the hull and the ______．A.Still water levelB.Wave crestC.Wave crest plus the charted water depth and tidal correctionsD.Wave crest plus the charted water depth and tidal correction and storm surge
In determining the scope of anchor line to pay out when anchoring a small boat, one must consider the ______.A.charted depth of water onlyB.depth of water, including tidal differencesC.time and date of anchoringD.type of anchor being used
单选题When anchoring,it is a common rule of thumb to use a length of chain（）.Afive to seven times the depth of waterBseven to ten times the depth of waterCtwice the depth of waterDtwice the depth of water plus the range of tide
单选题In moderate wind and current what should be the length of chain with a single anchor?（）A5 times the depth of the water in good holding groundB10 times the depth of the water in shallow waterC2 times the depth of the water in poor holding groundD8 times the depth of the water in deep water
单选题Air gap is the vertical distance between the bottom of the hull and the（）.Astill water levelBwave crestCwave crest plus the charted water depth and tidal correctionsDwave crest plus the charted water depth and tidal correction and storm surge
单选题There is not（）depth of water around the area centered at the lighthouse.AampleBsufficientCenormousDincredible
单选题The height of tide is the （）.Adepth of water at a specific time due to tidal effectBdifference between the depth of the water and the area's tidal datumCdifference between the depth of the water and the high water tidal levelDdifference between the depth of the water at high tide and the depth of the water at low tide
单选题What should you apply to a fathometer reading to determine the depth of water?（）ASubtract the draft of the vesselBAdd the draft of the vesselCSubtract the sea water correctionDAdd the sea water correction
单选题The distance between the surface of the water and the tidal datum is the （）.Arange of tideBheight of tideCcharted depthDactual water depth
单选题You are anchoring in 16 fathoms of water．On a small to medium size vessel，the（）.AAnchor may be dropped from the hawse pipeBAnchor should be lowered to within 2 fathoms of the bottom before being droppedCScope should always be at least ten times the depth of the waterDScope should always be less than 5 times the depth of the water
单选题Stand of the tide is that time when（）.Athe vertical rise or fall of the tide has stoppedBslack water occursCtidal current is at a maximumDthe actual depth of the water equals the charted depth
单选题The controlling depth of the river is（）.Athe minimum depth of the river prescribed in the channel maintenance programBthe edge of a dredged channelCthe highest level to which the river may rise without floodingDthe least available water in a channel which limits the draft of boats and tows
单选题The soundings on the chart are based on the depth of water available at （）.Amean low waterBmean lower low waterCmean high waterDmean high water springs
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To safely anchor a vessel there must be sufficient scope in the anchor cable. Scope is the ratio of（）.Aweight of cable to weight of vesselBweight of cable to weight of anchorClength of anchor to depth of waterDlength of cable to depth of water
单选题In bad weather，what length of chain should be used with a single anchor? （）A3 times the depth of waterB6 times the depth of waterC10 times the depth of waterD15 times the depth of water
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
单选题All echo-sounders can measure the（）.Aactual depth of waterBactual depth of water below keelCaverage depth from waterline to hard bottomDaverage depth of water to soft bottom
单选题When anchoring a vessel under normal conditions，which scope of chain is recommended? （）AFour times the depth of waterBTwo and one-half times the depth of waterCFive to seven times the depth of waterDFifteen times the depth of water