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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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