为清楚表达各种理论而提供简明、直观、有效的辅助工具是()
A.文字
B.图像
C.数理化
D.模式
参考答案:D
—I' m very sorry, Allen. I can't find your favorite CD.
——_____, Torn. I'll go and buy another one.
A. It doesn't matter B. Don't say that
C. Sure D. You are kidding .
蛋白质定量测定的经典方法是()。
A.凯氏定氮法
B.双缩脲法
C.酚试剂法
D.紫外分光光度法
E.盐析