下列运算正确的是( )
A:ab•ab=2ab
B:(3a)3=9a3
C:4a﹣3a=3(a≥0)
D: ab=abb(a≥0,b>0)
从建国初期国家机关的职权设置来看,虽然在《共同纲领》和宪法中分别规定了中央人民政府及中央人民政府委员会、全国人民代表大会是国家立法权的拥有者,但是拥有行政权的政务院及其之后的国务院所制定的规范及规范性法律文件占建国初期法律、法规及规范性文件数量的百分之八十以上,承担了国家绝大部分的立法任务。这主要表明建国初期( )
Do you know about Xiong'an? It's a new city near Baoding. There is a big lake in Xiong'an. Yes, it is Baiyangdian Lake. It is very big. In summer, you will see many beautiful lotus flowers on the lake. Some are red. Some are pink. Many people like them. There will be many boats on the lake. And there will be many birds singing in the grass. Xiong'an is beautiful and new. You can come here by bus from Baoding. And you can come here by train. You will play in the water with your friends. You will eat delicious fish. You will take many wonderful pictures. You will have a nice trip in Xiong'an.
下列反应中,葡萄糖被还原的反应有( )