单项选择题
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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A loaded hopper barge with independent tanks has a placard，with alternating red and white quadrants，on each side and end. Which statement concerning this barge is TRUE?（）
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