前后墙对冲布置
front and back wall cross collocation
前后墙对冲锅炉
opposed wall firing boiler
前前后后算法
forward-backward algorithm
前后对比法
Before-after comparison method
前后对准
front to back registration
前后墙布置燃烧器
front and back wall fired burner
治疗前后对比
contrast before and after treatment
八大前后
before and after The Eighth National Congress of t
避震器前后活塞杆
Piston Rod of Front and Rear