 |
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| 双动双管取芯钻具; 双动双层岩芯管; 双动双层取芯器 | |||
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| 双动双层岩芯管; 刚性双套筒岩芯管 | |||
| rigid- type double-tube core barrel: 7 phrases in 4 subjects |
| Drilling | 2 |
| Engineering geology | 2 |
| Oil / petroleum | 1 |
| Technology | 2 |
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| |||
| 双动双管取芯钻具; 双动双层岩芯管; 双动双层取芯器 | |||
| |||
| 双动双层岩芯管; 刚性双套筒岩芯管 | |||
| rigid- type double-tube core barrel: 7 phrases in 4 subjects |
| Drilling | 2 |
| Engineering geology | 2 |
| Oil / petroleum | 1 |
| Technology | 2 |