A:培养基中添加蔗糖的目的是提供营养和调节渗透压
B:培养基中的生长素和细胞分裂素影响愈伤组织的生长和分化
C:甘蓝叶肉细胞经脱分化产生的细胞的形态结构大体相同
D:小麦不同部位的细胞经培养获得的愈伤组织基因型都相同
听独白,完成信息记录表。
How far is the school from Peter's home?
It's about kilometers.
How does Peter go to school?
He goes .
How many students are there?
There are students.
Where is the park?
It's the school.
What does Peter do in the park?
He plays with his friends.
1.00mol NaCl中,所有Na+的最外层电子总数为8×6.02×1023(判断对错)