同义词
1)Gravity drop hammer,自落鎚2)Hammer,gravity drop,自落鎚3)air-lift gravity drop hammer,气提自落鎚4)Hammer,air-lift gravity drop,气提自落鎚5)Falling type by oneself,自落式6)free-fall mixers,自落式搅拌机7)automatic dropdown oxygen mask,自落式氧气面罩8)free-fall rocket core sampler,(自落)推进上浮取样管9)rotating concrete mixer,自落式混凝土搅拌机10)biconical gravity concrete mixer,双锥自落式混凝土搅拌机
