單項(xiàng)選擇題

An（）indicates that there is imminent risk for navigation.

A.distress alert
B.urgency message
C.safety message
D.routine message

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單項(xiàng)選擇題
A(n)（）indicates that there is serious danger for vessel, crew and passenger.
A.distress alert
B.urgency message
C.safety message
D.routine message
單項(xiàng)選擇題
A(n)（）indicates that is serious and inmmediate danger for vessel, crew and passengers.
A.distress alert
B.urgency message
C.safety message
D.routine message
單項(xiàng)選擇題
Cirrocumulus belongs to（）.
A.low clouds
B.High clouds
C.Special clouds
D.medium clouds
單項(xiàng)選擇題
Altostratus belongs to（）.
A.Low cl;ouds
B.High clouds
C.Special clouds
D.medium clouds
單項(xiàng)選擇題
（）is a high layer of cloud in the front of small flakes or cauhflower,white in colour with no dark shadows in between.
A.Cirrostratus
B.Cirrus
C.Cirrocumulus
D.Altostratus
單項(xiàng)選擇題
（）is a silvery cloud in the front of feathers or fibres seen high up against a blue sky.
A.Cirrostratus
B.Cirrus
C.Cirrocmulus
D.Altostratus
單項(xiàng)選擇題
（）are mainly caused by the gravitational pull of the moon.
A.Tides
B.Sea
C.Swell
D.Wind
單項(xiàng)選擇題
（）generally indicates that a gale or storm is approaching.
A.Falling barometric pressure
B.Rising barometric pressure
C.The circulations of winds
D.The change of wind direction
單項(xiàng)選擇題
（）indicates unstable weather.
A.The persence of cirrus clouds
B.The low-hanging stratus clouds
C.The altocumulus clouds
D.The massive cumulus clouds
單項(xiàng)選擇題
（）may be a warning for an approaching storm.
A.The persence of cirrus clouds
B.The low-hanging stratus clouds
C.The altocumulus clouds
D.The massive cumulus clouds

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