单选题A towboat is pushing barges ahead at a dangerously fast speed when().Athe towboat vibrates when backing downBthe roostertail exceeds the height of the main deckCa strain is placed on the face wiresDwater comes over the foredeck of the lead barges

单选题
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


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