| |||
| 美国石油学会重力指标 (美国石油学会采用的一种公认的石油比重指标，可粗略衡量石油的质量) | |||
| |||
| API 美国石油学会比重指数; API 比重美国石油学会 API 比重指数 | |||
| 美国石油学会标准比重 | |||
| API 比重 | |||
| English thesaurus | |||
| |||
| American Petroleum Institute gravity (index) | |||
| American Petroleum Institute fuel specific gravity | |||
| measure of liquid specific gravity as defined by the American Petroleum Institute | |||
|
API Gravity : 4 phrases in 4 subjects |
| Drilling | 1 |
| Engineering geology | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |