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（）.<br>A:main string<br>B:push string<br>C:power string<br>D:face string

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

出自：海船船员证

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