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| 碳同位素国际标准 PDB 标准; 白垩系皮狄组美洲拟箭石标准 | |||
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standard Peedee belemnite standard : 2 phrases in 2 subjects |
| Earth sciences | 1 |
| Technology | 1 |
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| |||
| 碳同位素国际标准 PDB 标准; 白垩系皮狄组美洲拟箭石标准 | |||
|
standard Peedee belemnite standard : 2 phrases in 2 subjects |
| Earth sciences | 1 |
| Technology | 1 |