单项选择题

Shipboard Emergency Drills must be carried out at least（）on board cargo ship.

A.Once every third year
B.Once a month
C.Once a year
D.Once a week

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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?（）

A.Flash point
B.Boiling point
C.Ignition point
D.Pour point
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