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單項選擇題

Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.

A.more serious
B.not less serious
C.more dangerous
D.no more dangerous

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單項選擇題

Conditions for crossing a rough bar are usually best at （）.

A.low water slack
B.high water slack
C.high water ebb
D.high water flood

單項選擇題

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

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