metallic coatings-review of porosity tests孔隙: small opening; hole; pore; a ...率: rate; ratio; proportion试验: experiment; test; trial评述: commentary孔隙率: absolute porosity; air porosity; air voids; factor of porosity; fractional void; percent of void; percentage of voids; poriness; porosity factor; void content; void factor; voidage; voids ratio下载手机词典可随时随地查词查翻译