PD

• abbr. 螺纹中径(=pitch diameter)
• abbr. 邮区(=postal district)

英英释义

Noun:

1. a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry

近反义词

【近义词】

• palladium [化]钯