单项选择题
A.low water slack B.high water slack C.high water ebb D.high water flood
Clearances of bridges and overhead cables below Bonnevi...
单项选择题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
Clearance gauges at bridges indicate （）.A.the height of...
单项选择题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
Attention is called to the fact that in many cases pipe...
单项选择题Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
A.concealed B.buried C.existed D.built
