“purchase by grade”的概念、定义、翻译、参考文献-科学参考

单词	purchase by grade
释义	purchase by grade 分等收购
随便看	unit-frame unit function unit gain unit gap unit graph unit head unit head boring machine unit head broaching machine unit head drilling machine unit head machine unit head milling machine unit head tapping machine unit head turning machine unit heater unithiol unit-holder unit horsepower unit hydrograph unit-hydrograph duration unit hydrograph method unit improvement factor unit impulse unit impulse function unit-impulse response unit impulse response

科学参考收录了1248194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。