[问答题,简答题] 计算题：某避雷器在温度t=35℃时的电导电流I=537.5μA，若温度每上升1℃，电导电流增加5‰，那么20℃时的电导电流I₂₀是多少？

YJ17吸丝成形系统铲丝刀出口间隙比烟舌入口低（）mm。 ["0.1～0.2","0.2～0.3","0.3～0.5","0.5～1.0"] YJ17吸丝成形系统铲丝刀前缘与出口处（）平齐。 ["烟枪","压板","烟舌","带轮边缘"] YJ17吸丝成形系统铲丝刀入口与吸丝带之间的距D＝（）mm。 ["0.10","0.20","0.25","0.30"] YJ19供料系统烟枪在安装了布带的情况下铲丝刀的出口高度烟枪底面的值为（）mm。 ["7.8","8.2","8.6","9.0"] YJ19供料系统铲丝刀与吸丝带之间的间隙为（）mm。 ["0.05","0.1","0.15","0.2"] 计算题：某避雷器在温度t=35℃时的电导电流I=537.5μA，若温度每上升1℃，电导电流增加5‰，那么20℃时的电导电流I₂₀是多少？