the surface of the sea
high waters and low waters
all low waters
the lower of the two daily low tides
第1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2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3题：
On which of the following statements would the author most probably agree?
[A] Non-Americans add to the average height of the nation.
[B] Human height is conditioned by the upright posture.
[C] Americans are the tallest on average in the world.
[D] Larger babies tend to become taller in adulthood.
题干中提到“most probably..”，通过排出法，可以确定B为最佳选项。
第4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5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6题：
The height of a light is measured from which reference plane?
A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
第7题：
The period at high or low tide during which there is no change in the height of the water is called the ______.
A.range of the tide
B.plane of the tide
C.stand of the tide
D.reversing of the tide
第8题：
In a weather report GMT stands for ________ ．
A.Greenwich Mean Time
B.Local Mean Time
C.General Cargo
D.General Average
第9题：
The soundings on the chart are based on the depth of water available at ______.
A.mean low water
B.mean lower low water
C.mean high water
D.mean high water springs
第10题：
Mean low water is the average height of ______.
A.the surface of the sea
B.high waters and low waters
C.all low waters
D.the lower of the two daily low tides