单项选择题
No navigational aids are shown and the chart is not kept corrected for alterations in depths inside the pecked lines. For more detailed information, the larger scale charts must be（）.
A.referred to B.appreciated C. met with D.concerned
单项选择题 0cean passages for the world and routing charts should be（）for trans-oceanic information.
单项选择题 Of the following,（）is not a wind.
单项选择题 Risk of collision may be deemed to exist（）.
