“item difficulty index”的概念、定义、翻译、参考文献-科学参考

单词	item difficulty index
释义	item difficulty index Encyclopedia 理学【基本概念】释 item difficulty index题目难度指数测验题目难易程度的度量指标。
随便看	railway signaling reliability railway signaling vital relay railway sound barrier railways passenger car equipment railway station railway station and terminal railway structural deformation survey railway subgrade engineering railway subgrade maintenance railway subgrade non-destructive detection railway switch transition equipment railway tank car railway tanker railway technical station railway terminal railway ticket railway timber transportation railway time synchronization network railway track railway track maintenance and renewal railway traction network railway traffic accident railway traffic capacity railway traffic control railway traffic hygiene quarantine

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。