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metal head 〔俚語〕重金屬搖滾樂迷。

metal lath

Roadway lighting equipment - metal heads and reflector assemblies - mechanical and optical interchangeability 道路照明設備.路燈的金屬頭和反光器組件.機械互換性與光學互換性

Roadway lighting - socket support assemblies for use in metal heads , mechanical interchangeability 道路照明.金屬頭中使用的燈座支撐組件的機械互換性