苯甲酸雌二醇
A．四氮唑比色法B．铁-酚试剂比色法C．异烟肼比色法D．气相色谱法E．碘量法下列药物可采用的含量测定方法为
参考答案：D
He was so tired that he didn't want to do .[ ]
A. something
B. anything
C. nothing
D. everything
蒙古族民歌按照体裁分类，可以分为短调和（）两类。
A.民歌
B.长调
C.大调
D.小调
