Between April and November, squalls（）as Sumateras（）in Malacca Strait in the late afternoon or overnight and（）E to affect the W coast of Malaysia and Singapore Island.

A.Your speed must be reduced to bare steerage ways
B.A look-out is not required if the radar is on
C.The radar should always be kept on a short-range scale
D.Fog signals are only required when a vessel is detected by radar

A.The designated person
B.The captain
C.All officers and crew
D.All senior officer

A.Cold fronts are more violent and of shorter duration
B.Cold fronts are milder and last longer
C.They are very similar with the exception of wind direction
D.Warm fronts are more violent and of longer duration