胰液缺乏时，消化和吸收不受影响的物质是（）
A.蛋白质
B.脂肪
C.维生素D
D.维生素A
E.双糖和单糖
参考答案：E
Even teachers can't understand some expressions _____ their students use in daily life.[ ]
A. whose
B. who
C. that
D. whom
汽轮机内形成沉积物的原因是什么？
