| 1. | Gross registered tonnage 注册容积总吨 |
| 2. | Net registered tonnage 注册容积净吨 |
| 3. | Net registered tonnage nrt 登记净吨 |
| 4. | Nrt net register tonnage 净登计吨 |
| 5. | The shipping register recorded a 7 . 8 million gross registered tonnage ( grt ) at the end of 1996 . the fleet comprised 544 vessels 一九九六年年底,船舶注册纪录册的总注册吨位达780万吨,纪录册上的船只共有544艘。 |