【化】 黑色氧化物(指VO-3)

结果表明，其耐磨损、耐腐蚀性能均高于氧化和磷化黑色膜层。

flies wings and black flowers

black box theory

black-striped snapper

black skin

disperse black brown

cotton black e extra

handshaken black yakhair

black and white dup-negative film