药物代谢反应的类型中不正确的是（）
A.氧化反应
B.水解反应
C.结合反应
D.取代反应
E.还原反应
参考答案：D
改错,选出错误的一项并改正
1. We works at school from Monday to Friday. _____
A B C D
2. My father are good at drawing pictures. _____
3. His brother is born on 1st October, 1985. _____
4. Mary like listening to music very much. _____
5. She has lot of work to do today. _____
设平面上连续曲线y=f(x)(a≤x≤b，f(x)＞0)和直线x=a，x=b及x轴所围成的图形绕x轴旋转一周所得旋转体的质心是(
,0，0)，则
的定积分表达式是______．
,0，0)，则
的定积分表达式是______．