單項選擇題Five or more short blasts on a vessel’s whistle indicates that she is().

A.In doubt that another vessel is taking sufficient action to avoid a collision
B.Altering course to starboard
C.Altering course to port
D.The stand-on vessel and will maintain course and speed


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1.單項選擇題Every vessel which is directed by these Rules to keep out of the way of another vessel shall,if the circumstances of the case admit,avoid().

A.Crossing ahead of the other
B.Crossing astern of the other
C.Passing port to port
D.Passing starboard to starboard

4.單項選擇題During the day,a vessel picking up a submarine cable shall carry().

A.Three shapes,the highest and lowest shall be red balls,and the middle shall be a white diamond
B.Two black balls
C.Three shapes;the highest and lowest shall be black balls,and the middle shall be a red diamond
D.Three shapes;the highest and lowest shall be black balls and the middle shall be a black diamond

5.單項選擇題Dring a period of “whiteout”,you should expect which of the following().

A.Snowfall or blowing snow
B.Lack of ability to estimate distance
C.Harsh contrast between sun-illuminated snow cover and the background
D.Hazy horizons with extensive mirage effects