数据库 数据库新技术 释文 document type definition, DTD 文档类型定义
- Ryan
- Ryanair Holdings plc
- Ryanggang
- Ryazan
- Ryazan oblast
- Rydberg
- rydberg
- Rydberg atom
- Rydberg constant
- Rydberg correction
- Rydberg formula
- Rydberg frequency
- Rydberg molecule
- Rydberg orbital
- Rydberg series
- Rydberg state
- Rydberg state molecule
- Ryder Cup
- rye
- ryegrass Pyrenophora leaf spot
- ryegrass rust
- rye stem rust
- Ryle, Sir Martin
- Ryle Telescope
- Rynd