短語詞組短語primary Brinell hardness standard machine 原級勃氏硬度標(biāo)準(zhǔn)機(jī)secondary Brinell hardness standard machine 副基準(zhǔn)佈氏硬度機(jī)Working standard Brinell hardness machine 工作基準(zhǔn)佈氏硬度機(jī) 返回 brinell hardness standard machine