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| 有效寿命指仪器或设备的使用年限 | |||
| 有效使用期限 | |||
| 有效期 | |||
| 有效使用期 | |||
| 有效寿命 (time); 有效寿期 (time); 有效使用期 (time) | |||
| 有效寿命 | |||
| effective life: 12 phrases in 8 subjects |
| Chemistry | 1 |
| Desert science | 1 |
| Electronics | 2 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Nuclear physics | 1 |
| Oil / petroleum | 1 |
| Technology | 4 |
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