工学 用电安全技术 释 protective earthing 保护接地 将电气设备的某些部分用导线（接地线）与埋设在土壤中或水中的金属导体（接地体）相连接的做法。又称安全接地。
计算机硬件 计算机工程设计 释文 protective earthing 保护接地
- upshift
- upshot
- upside
- upside-down
- Upsilon particle
- upsilon particle
- Upsilon粒子
- upslip
- upslope
- UPS projection
- upstream
- upstream activating sequence
- upstream activation sequence
- upstream activation sequence (UAS)
- upstream expressing sequence
- upstream promoter element
- upstream promoter element (UPE)
- upstream repressing sequence
- upstream scheme
- upstream sequence
- upswept
- uptake
- uptake coefficient
- uptempo
- upthrow