單項選擇題

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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A.ISM
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The dew point temperature is（）.
A.always higher than the air temperature
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Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）
A.coastal breeze
B.sea breeze
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Which of the following shall not the officers in charge of the navigational watch do?（）
A.continue to be responsible for the safe navigation of the ship
B.Leave the bridge
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The helm command PORT TWENTY means（）.
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The circulation around a low pressure center in the Northern Hemisphere is（）.
A.counterclockwise
B.variable
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D.anticyclonic
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A.within two hours
B.within three hours
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It is dangerous for vessels without the operational radar（）the estuary.
A.to get
B.to approach
C.to proceed
D.to close