系统软件 操作系统 释文 general purpose operating system 通用操作系统
- urea formaldehyde
- urea formaldehyde resin
- urea-formaldehyde resin
- urea-formaldehyde resins
- urea herbicide
- urea phosphate
- Ureaplasma urealyticum infection
- urea poisoning
- urea prilling tower
- urea resin
- urease
- urediniospore
- uredinium
- urediospore
- uredium
- uredosorus
- uredospore
- uredostage
- ureilite
- urelement
- Urengoy-Uzhhorod Gas Pipeline
- ureogenesis
- uresis
- ureter
- ureteralgia