短語詞組短語small carbon number 低碳數(shù)small mould number gear 小模數(shù)齒輪small tooth number 少齒small Reynolds number 小雷諾數(shù)small cavitation number 小空化數(shù)small tooth number difference 少齒差small tooth number gear 少齒數(shù)齒輪small mould number 小模數(shù)small teeth number difference 少齒差small tooth number difference transmission 少齒差傳動 返回 small number