单项选择题
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.Prohibited from anchor D.Prohibited from anchoring
单项选择题 The range of a light on Admiralty Charts is normally the（）.
单项选择题 The height of a tide can be increased by（）.
单项选择题 Steam smoke will occur when（）.
