單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

Day-shapes must be displayed（）.

A.Between sunset and sunrise
B.Only between 8 AM and 4 PM
C.During daylight hours in any visibility
D.During daylight hours in unrestricted visibility only

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During the day，a vessel picking up a submarine cable shall carry（）.

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Dring a period of “whiteout”，you should expect which of the following（）.

Day-shapes must be displayed（）.

During the day，a vessel picking up a submarine cable shall carry（）.

Dring a period of “whiteout”，you should expect which of the following（）.