单项选择题

A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of（）.

A.a vessel towing by pushing ahead
B.a power-driven vessel，not towing
C.a barge being pushed ahead
D.either answer A or answer B

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单项选择题

A towboat is pushing barges ahead at a dangerously fast speed when（）.

A.the towboat vibrates when backing down
B.the roostertail exceeds the height of the main deck
C.a strain is placed on the face wires
D.water comes over the foredeck of the lead barges

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

单项选择题

A spreader bar is used to（）.

A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
D.protect the upper part of a load