A towboat is pushing barges ahead at a dangerously fast speed when（）.<br>A:the towboat vibrates when backing down<br>B:the roostertail exceeds the height of the main deck<br>C:a strain is placed on the face wires<br>D:water comes over the foredeck of the lead barges

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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