单项选择题

Every vessel which is（）to keep out of the way of another vessel shall，so far as possible，take early and substantial action to keep well clear.

A.detected
B.decided
C.directed
D.deceased

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单项选择题

Every vessel shall（）maintain a proper look-out by sight and hearing as well as by all available means appropriate in prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.

A.in fog
B.at night
C.in narrow fairway
D.at all times

单项选择题

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

单项选择题

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