单项选择题
Full details of all lights and fog signals are shown on（）.
A.large scale chart B.small scale chart C.ocean chart D.routing chart
单项选择题 What is it called when it is possible to ignite the vapour above the oil?（）
单项选择题 Manoeuvring information can not be obtained from（）.
单项选择题 Fog is likely to occur when there is little difference between the dew point and the（）.
