“plastic ball indentation hardness tester”的概念、定义、翻译、参考文献-科学参考

单词	plastic ball indentation hardness tester
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科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。