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單項選擇題

Vessels are warned（）in the area enclosed by pecked lines owing to the existence of numerous telegraph cables.

A.anchor
B.to anchor
C.not to anchor
D.not to anchoring

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單項選擇題

Vessels should not anchor or trawl in the vicinity of pipelines and are（）.in the pipeline area shown on the chart.

A.prohibit to anchor
B.prohibited to anchor
C.not to anchor
D.prohibited from anchoring

單項選擇題

Vessels transiting Suez Canal are charged according to their（）.

A.gross tonnage
B.Suez Canal tonnage's
C.net tonnage's
D.Panama Canal tonnage's

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