短語詞組短語main hull girder 主船躰桁Ship hull girder Strength 船舶縂強度calculation of hull girder 船梁計算書hull girder shear strength 船躰梁剪切強度hull girder stress 船躰桁應力ship hull girder 船躰梁Hull girder collapse 船躰支架破壞basic hull girder 基本船躰梁ultimate strength of hull girder 船躰梁極限強度 返回 hull girder