單項選擇題

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.port and starboard strings
B.outer strings
C.drag strings
D.side strings

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單項選擇題

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

A.a mechanical breakdown on the tug
B.adverse tidal current conditions
C.the tug reducing its speed
D.All of the above

單項選擇題

A time diagram is a diagram on the plane of the（）.

A.celestial meridian
B.celestial equator
C.celestial horizon
D.principal vertical circle