period
range
distance
depth
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：
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3题：
A high rate of separation between oil and water is favored by ______.
A.large size of oil globule(小球)
B.low temperature
C.high viscosity
D.high flow rate
第4题：
The average height of the surface of the sea for all stages of the tide over a 19 year period is called ______.
A.mean high water
B.mean low water
C.half-tide level
D.mean sea level
第5题：
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
第6题：
The meaning of ebb tide is that ______.
A.tide is falling from high water to low water
B.tide is rising from low water to high water
C.tide is reaching to a highest level
D.tide is reaching to a lowest level
第7题：
Contour elevations on this chart refer to heights in feet above mean ______.
A.lower low water
B.high water
C.low water
D.sea level
第8题：
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean ______.
A.lower low water
B.high water
C.low water
D.sea level
第9题：
The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to ______.
A.a difference in water pressure
B.the method of breaking up the water stream
C.the length of the applicator
D.All of the above
第10题：
The reference datum used in determining the heights of land features on most charts is ______.
A.mean sea level
B.mean high water
C.mean low water
D.half-tide level