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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单项选择题
Manoeuvring information can not be obtained from（）.

A.construction plans
B.sea trials
C.calculation estimates
D.SMS procedure file
单项选择题
Fog is likely to occur when there is little difference between the dew point and the（）.

A.relative humidity
B.air temperature
C.barometric pressure
D.absolute humidity
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