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單項(xiàng)選擇題

（）LOW ELY SLWLY WITH COLD FRONT FM CEN TO 12N 179W AND WARM FROM FM CEN TO 11N 171W.

A.SHLW
B.SCTD
C.OBS
D.SW

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單項(xiàng)選擇題

The Routing System which aimed at reducing the risk of casualties is called as（）.

A.Traffic Separation Schemes
B.Recommended tracks
C.Precautionary areas
D.Inshore traffic zones

單項(xiàng)選擇題

When winds of force reach 10-11 in Beaufort Scale，usually we call such winds as（）.

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