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单选题
The distance between the surface of the water and the tidal datum is the （）.
A
range of tide
B
height of tide
C
charted depth
D
actual water depth
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考题
单选题Air gap is the vertical distance between the bottom of the hull and the（）.A
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单选题The height of tide is the （）.A
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whatB
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thatD
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the distance between them is changingC
the position between them is not changingD
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AsB
OnceC
IfD
Although
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from the still water plane to the crestB
from the still water plane to the troughC
from crest to troughD
between water levels at one-quarter of the wave's length
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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
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