单项选择题

What is the meaning of the word “ROGER” when used in radio communication?（）.

A.Please repeat your message
B.Not readable
C.Correct
D.I have received your transmission satisfactorily

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In the Northern Hemisphere, when the low pressure center at your location is northerly, causing the wind is located to your（）.

A.NNW
B.WSW
C.ESE
D.SSW

单项选择题

According to SOLAS the breathing air apparatus that must be onboard shall have sufficient capacity for how many minutes of operation?（）.

A.20
B.30
C.45
D.60