| 1. | The mirror is concave .
镜子呈凹面。 |
| 2. | the spectrograph uses a concave diffraction grating that provides a wavelength dispersion of 4. 2a°/mm in the first order.
光谱仪用了一块凹面衍射光栅，第一级光谱的色散度为42埃毫米。 |
| 3. | Holes and traps for t - head bolts - design standard
T形头螺钉的安装孔和接触凹面.设计标准 |
| 4. | Equipment for working the soil . concave disks
土壤耕作机械.凹面圆盘 |
| 5. | Abney mounting for concave grating
阿布饰凹面光栅装置 |
| 6. | Jewels for fine mechanics ; jewels with concave shape for watthour - meters
精密机构的轴承宝石.电度表用凹面宝石 |
| 7. | Debossed logo with 6 colour ink fill as per artwork and layouts
六种颜色的油墨按艺术布局填充的凹面图形标志。 |
| 8. | A depression similar to that in a shallow concave container for food
凹形，凹面与浅的凹型盛食物的容器相似的凹处 |
| 9. | Equipment for sowing and planting ; disks , concave disks type d1 , dimensions
播种和种植设备.圆盘. d1型凹面圆盘.尺寸 |
| 10. | Concave optical tool
光学玻璃凹面磨具 |
