stranded conductor made of hard drawn copper wire是什么意思

用法例句

However,compared with common acid bright copper plating,the available additives for acid hard copper plating are rather few,and the researches related to the factors affecting hardness of the coatings are even fewer.

近年来,铁基圆筒电镀厚铜替代铜辊的电镀硬铜加工量随凹印制版产量的增加而急剧增长。