(report报告;umbrella雨伞)
Cities
Weather
Beijing
It's sunny, but it will be ____ in the afternoon.
Qingdao
The weather is fine and ____.
Harbin
It's snowy and ____.
Xi'an
It's sunny and warm.
Guangzhou
It's ____ and ____
设整数. 若存在实数t,使得t=1,t2=2,…,tn=n
同时成立,则正整数n的最大值是( )
选项
实验目的
试剂1
试剂2
A
蛋白质的鉴定
CuSO4溶液
NaOH溶液
B
绿叶中色素的提取
CaCO3
SiO2
C
解离植物根尖
盐酸
酒精
D
植物组织培养
生长素
细胞分裂素