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| ringhole | |||
| sample point; sampling hatch | |||
| sample connection; sample port; thief hatch; thief hole | |||
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取样口 : 17 phrases in 6 subjects |
| Aviation | 1 |
| Computers | 1 |
| Laboratory equipment | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 5 |
| Technology | 5 |
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