甾体母核为C17侧链具有8~10个碳原子链状侧链的是()
A.螺甾烷醇型甾体皂苷
B.胆汁酸类
C.植物甾醇
D.C21甾体化合物
E.呋甾烷醇型甾体皂苷
参考答案:C
读一读,重新排顺序。
( ) All right. We clean the desks and chairs.
( ) Good morning. Let's clean the classroom.
( ) Wow! It's nice and clean. Good job.
( ) Let's clean the desks and chairs.
( ) Good idea.
商务便宴首先要考虑的是()。