| 1. | It looks like quartz crystals sticking up out of the dark hollow .
它象石英晶体，在黑色的空间耸立着。 |
| 2. | Today, quartz crystal clocks are generally used on the seismograph stations .
目前，地震台站一般采用石英晶体钟。 |
| 3. | Test method for optical grade synthetic quartz crystal
人造光学石英晶体试验方法 |
| 4. | Designation for lumbered synthetic quartz crystal
人造石英晶体棒材型号命名方法 |
| 5. | 1 generic specification of quartz crystal units erratum 1
石英晶体装置的总规范 |
| 6. | Temperature control devices for quartz crystal units
石英晶体谐振器的温度控制装置 |
| 7. | Testing method for optical - grade synthetic quartz crystal
人造光学石英晶体试验方法 |
| 8. | Test - fixture of surface mounting quartz crystal units
表面安装石英晶体元件的试验台 |
| 9. | In 1968 , prototype quartz crystal watches were introduced
1968年推出样机石英手表 |
