單項選擇題When force of winds reaches 10-11 in Beaufort scale，we usually call such wind（）.

A.Gale
B.Storm
C.Hurricane
D.Typhoon


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1.單項選擇題When a high pressure system is centered north of your vessel in the Northern Hemisphere（）.

A.You should experience hot，moist，clear weather
B.The wind direction is generally easterly
C.The winds should be from the southwest at your location
D.The winds should be brisk

2.單項選擇題What will a veering wind do（）.

A.Change direction in a clockwise manner in the Northern Hemisphere
B.Circulate about a low pressure center in a counterclockwise manner in the Northern Hemisphere
C.Vary in strength constantly and unpredictably
D.Circulate about a high pressure center in a clockwise manner in the Southern Hemisphere

3.單項選擇題What benefit is a weather bulletin to a mariner（）.

A.It provides a legal reason to cancel a projected voyage
B.It allows the mariner to make long term weather forecasts
C.It is of little benefit since the weather changes frequently and rapidly
D.It gives the mariner time to prepare for weather changes

4.單項選擇題West backing south-west gale 8 locally storm 10（）then rain or sleet mainly good.

A.windy showers
B.showers with winds
C.wintry showers
D.showery winds

5.單項選擇題Weather observations provided by each weather station include all of the following except（）.

A.temperature
B.visibility
C.predicted weather for the next twelve hours
D.barometric pressure and change in the last three hours