單項選擇題Which type of precipitation is a product of the violent convection found in thunderstorms（）.

A.Snow
B.Freezing Rain
C.Hail
D.Sleet


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1.單項選擇題Which of the following is not a wind（）.

A.Growler
B.Norther
C.Levanter
D.Mistral

2.單項選擇題Which condition suggests that your present position lies in the navigable semicircle of a tropical storm（）.

A.A backing wind
B.A veering wind
C.Sustained gale force winds
D.A strong wind that maintains a constant speed and direction

3.單項選擇題Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.

A.A backing wind
B.A veering wind
C.A norther
D.A strong，gusty wind

4.單項選擇題When your vessel is on or near the path of an approaching tropical storm the（）.

A.wind direction remains steady
B.wind speed increases
C.barometer falls
D.All of the above

5.單項選擇題When experiencing heavy winds，you should reef sails to（）.

A.bring the sails parallel to the wind
B.reduce sail area exposed to the wind
C.allow the sails to catch more wind
D.remove all tension on the main and jib sheets