短語詞組短語strength h calculation 強度計算boiler strength calculation 鍋爐強度計算fatigue strength calculation 疲勞強度計算strength calculation of gear 齒輪強度計算flexural strength calculation 承載力計算corresponding strength calculation 強度計算field strength calculation 場強計算strength calculation and check 強度校核launching strength calculation 下水強度計算 返回 strength calculation