| 单词 | penetration number |
| 释义 | penetration number [´pen·ǝ`trā·shǝn ´nǝm·bǝr] ENGINEERING The consistency of greases, waxes, petrolatum, and asphalt or other bituminous materials expressed as the distance that a standard needle penetrates the sample under specified American Society for Testing and Materials test conditions. |
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