Standard specification for tinned soft or annealed copper wire for electrical purposes 电工用途镀锡软的或退火的铜丝的标准规范
4 coefficient of linear expansion : - at a temperature of 20 ? c , the coefficient of linear expansion of standard annealed copper is 0 . 000017 per degree centigrade 线膨胀系数：在温度20的情况下，标准退火铜的线膨胀系数应是0 . 000017每摄氏温度。
The annealed copper stranded wire is a kind of annealed conductors for electric apparatuses ( such as transformer , furnace , etc . ) of transmissionm and distribution , electronic equipments and the components of silicon controlled rectifier as well 铜软绞线是输配电用电气装置（如变压器、电炉）及电子电器设备、可控硅元件的软连接线。
