vertical distance from the chart sounding datum to the ocean bottom，plus the height of tide
vertical distance from the chart sounding datum to the ocean bottom
average height of water over a specified period of time
average height of all low waters at a place
第1题：
The height of tide is the ______.
A.depth of water at a specific time due to tidal effect
B.difference between the depth of the water and the area's tidal datum
C.difference between the depth of the water and the high water tidal level
D.difference between the depth of the water at high tide and the depth of the water at low tide
第2题：
Charted depth is the ______.
A.vertical distance from the tidal datum to the ocean bottom plus the height of the tide
B.vertical distance from the tidal 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
第3题：
On small scale charts of ocean areas where hydrographic information is，in many cases，still sparse，charted shoals may be in error as regards______．
A.position
B.position，depth and extent
C.depth and extent
D.position and extent
第4题：
A microbarograph is a precision instrument that provides a ______．
A.charted record of atmospheric temperature over time
B.charted record of atmospheric pressure over time
C.graphic record of combustible gases measured in an atmosphere
D.graphic record of vapor pressure from a flammable/combustible liquid
第5题：
To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is ______．
A.the actual depth
B.added to or subtracted from the charted depth
C.multiplied by the charted depth
D.divided by the charted depth
第6题：
Charted depth is the ______.
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
第7题：
Charted depths are decreased ______ 2 meters．
A.in
B.on
C.with
D.by
第8题：
Clearance gauges at bridges indicate ______.
A.the height of the tide
B.depth of water under the bridge
C.charted vertical clearance at mean low water
D.distance from the water to low steel of the bridge
第9题：
Air gap is the vertical distance between the bottom of the hull and the ______．
A.Still water level
B.Wave crest
C.Wave crest plus the charted water depth and tidal corrections
D.Wave crest plus the charted water depth and tidal correction and storm surge
第10题：
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