单选题A tow of 9 barges is made up three abreast and three long. The towboat is faced up to the center string which is known as the（）.Amain stringBpush stringCpower stringDface string
单选题
A tow of 9 barges is made up three abreast and three long. The towboat is faced up to the center string which is known as the（）.
A
main string
B
push string
C
power string
D
face string
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