单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
A time diagram is a diagram on the plane of the（）.
A.celestial meridian
B.celestial equator
C.celestial horizon
D.principal vertical circle -
单项选择题
A time diagram is a diagram of the celestial sphere as observed from above the（）.
A.south celestial pole
B.north celestial pole
C.observer's meridian
D.Greenwich meridian
