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| 期間 (A period of time in which a given event is valid. The valid time interval includes the valid start time, and all moments of time up to, but not including the valid end time, きかん) | |||
| 時間間隔 (ぢかん・かんかく) | |||
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time interval : 6 phrases in 5 subjects |
| General | 1 |
| Piezoelectric crystals | 2 |
| Power lines | 1 |
| Power system protection | 1 |
| Technology | 1 |