性爱无码高清电影|亚洲第一播放器|国产精品日日摸夜夜摸添孕妇|日本在线不卡免费|日韩A片大全在线观看|国产精品Av在线观看|欧美日韩另类一级二级|国产一区二区三区高清无码|成人网站在线观看视频|TS女神第一福利视频

The glue that holds the grid together is a network of transformers, the hulking gray boxes of steel and copper that weigh up to 800,000 pounds and make it possible to move power long distances. Transformers were badly damaged in an attack on a California substation last year, and government reports have warned for years that saboteurs could cause sustained damage to the grid by targeting the massive machines.
 

• [Editor:editer]