co
名词 co:
an odorless very poisonous gas that is a product of incomplete combustion of carbon
同义词:carbon monoxide, carbon monoxide gas
a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
同义词:cobalt, atomic number 27
one who refuses to serve in the armed forces on grounds of conscience
a state in west central United States in the Rocky Mountains
同义词:Colorado, Centennial State