回肠切除术后,影响吸收的物质是()
A.蛋白质
B.脂肪
C.糖类
D.无机盐
E.维生素B12和胆盐
参考答案:B, E
She still faild in the exam, _____ she tried her best. [ ]
A. though
B. because
C. if
将氧化物划分为玻璃生成体、网络外体和中间体化合物的依据是什么?