数据库 数据库管理系统及其实现技术 释文 existing constraint 存在约束
- soil shrinkage
- soil sickness in protected vegetable production
- soil silicon
- soil slip
- soil slope
- soil slope design
- soil sodication
- soil solidification
- soil solute breakthrough curve
- soil solute transport
- soil solution
- soil solution chemical equilibrium
- soil solution chemistry
- soil solution electrolyte
- soil solution ion
- soil solution ionic activity
- soil solution ionic hydration
- soil solution ionic strength
- soil spatial analysis
- soil spatial pattern in China
- soil spatial variability
- soil spatiotemporal evolution
- soil specific surface area
- soil spectroscopy
- soil spraying gun