单项选择题
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
Attention is called to the fact that in many cases char...
单项选择题Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
A.one nautical mile B.two kilometers C.5 cables only D.one fathom
