A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.

A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. The outer two strings of barges are the（）.

A tow can override its tug as a result of（）.

A time diagram is a diagram of the celestial sphere as observed from above the（）.

A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.

A slow，gradual fall of the barometer indicates approaching（）.

A stage should only be rigged（）.

A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.

A stretch where the channel changes from one side of the river to the other is called a （）.

A thin，whitish，high cloud popularly known as “mares’ tails” is（）.