The pit cover should be sealed over with tar paper or plastic.
顶盖必须用焦油纸或塑料封闭。
If a man uncovers a pit or digs one and fails to cover it and an ox or a donkey falls into it.
人若敞着井口，或挖井不遮盖，有牛或驴掉在里头。
Extra large body of bridge bears the whole main bearing foundation of structure of bridge, service life and security of the whole bridge of back cover quality relation of the foundation pit.
特大型桥梁的锚体或承台都是全桥的主要承重结构的基础，基坑的封底质量关系全桥的使用寿命和安全。
应用推荐