A. OK.
B. Thank you.
C. Two books.
D. It's on the fan.
E. Yes, it is.
(____)1. Let me help you.
(____)2. Where is the bee?
(____)3. What's on the desk?
(____)4. Is it your picture?
(____)5. Let's clean the classroom.
过圆内的一点(非圆心)有 ____条直径.
若生殖细胞内染色体数目为n.从亲代到生殖细胞再到子代,细胞中染色体数目变化规律是( )
—_____________ .
(Ⅰ)求实数a,b的值;
(Ⅱ)求函数 f(x) 在 1e,e 上的最大值.