 |
| |||
| 安全系数 | |||
| coefficient of safety: 7 phrases in 4 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Cosmetics and cosmetology | 1 |
| Technology | 4 |
|
| |||
| 安全系数 | |||
| coefficient of safety: 7 phrases in 4 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Cosmetics and cosmetology | 1 |
| Technology | 4 |