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（）.<br>A:port and starboard strings<br>B:outer strings<br>C:drag strings<br>D:side strings

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

出自：海船船员证

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