A rampart built around the top of a castle with regular gaps for firing arrows or guns. 围绕城堡顶部建的防御工事,它上面均匀地分布有枪眼或弓箭眼。
Development of Top-Firing Air and Gas Self-Preheating Hot Blast Stove 顶燃式空气、煤气自身双预热热风炉的开发与应用
Development and practice of 2nd generation top firing hot blast stove 第二代顶燃式热风炉的研制与实践
Temperature difference from top to bottom in preheating zone of tunnel kiln is the biggest obstacle for rapid firing, energy saving. 隧道窑预热带内上下温差过大是实现快速烧成、节能降耗的最大障碍。