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| 介子; 重电子 (meson, mesotron 之旧称); 射线透射密度测量仪; 电压穿透式彩色管; γ 射线穿透仪; γ 透射测厚仪 | |||
| γ-射线穿透仪 | |||
| 伽马射线管壁厚度测定仪 | |||
| V射线透射测厚仪; 重电子 | |||
| 穿透型彩色管 | |||
| 伽马射线穿透仪; 透射密度测量仪 | |||
| 重电子 (即介子) | |||
| penetron: 2 phrases in 2 subjects |
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| Technology | 1 |
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