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| 频率，度，数; 周率; 发生次数; 出现率; 频繁; 时常〔屡次〕发生; 期刊出版周期 | |||
| 频率 | |||
| 恒有度 | |||
| frequence: 28 phrases in 11 subjects |
| Compressors | 1 |
| Electric machinery | 1 |
| Electronics | 5 |
| Engineering geology | 1 |
| Hydroelectric power stations | 2 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Plastics | 11 |
| Space | 2 |
| Technology | 1 |
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