单选题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（）.Aport and starboard stringsBouter stringsCdrag stringsDside strings
单选题
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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