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单词
ruling grade
释义
WordReference Random House Unabridged Dictionary of American English © 2024
rul
′
ing grade′,
[
Railroads.
]
Rail Transport
the steepest grade on a given stretch of track, which determines the maximum tonnage that can be hauled in a train having a given horsepower at a stated minimum speed.
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更新时间:2025/7/2 4:45:00