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推送速度 pushing speed
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考题
单选题A towboat is pushing barges ahead at a dangerously fast speed when().A
the towboat vibrates when backing downB
the roostertail exceeds the height of the main deckC
a strain is placed on the face wiresD
water comes over the foredeck of the lead barges
考题
名词解释题驼峰推送部分 pushing section of hump
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