某些国家对运输木材按“板尺(board foot)”和“霍普斯尺(hoppus foot)”计算运费(12板尺一o．785霍普斯尺一1立方英尺)。
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N a unit of volume equal to 1.27 cubic feet, applied to timber in the round, the cross-sectional area being taken as the square of one quarter of the circumference 霍普斯英尺
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