Europe's biggest Stone Age earthworks are at Silbury Hill in Wiltshire.欧洲石器时期最大的土木防御工事位于威尔特郡的西尔布利山。A fuze delay allows penetration of dense woods and light earthworks.用于炮弹穿透浓密的林木和轻型土木工事.The enemy attacked the earthw...
这就是所谓 “ 水平 回扫 ” 过程.This is called the " horizontal - fly - back " phase.彩电的安全性与可靠性很大程度上决定于回扫变压器.The safety and reliability of color TV set depend on flyback transformer to a great extent....