①Fe3O4 ②Fe(OH)3 ③FeCl2 ④FeCl3.
A:①④
B:①②④
C:①③④
D:①②③④
阿拉伯数字的发明者和传播者分别是( )
Like is name toy bears play kites don’t
My ____is Anna. I am eight years old. I'm a girl. I ____ kites and dolls. This ____Mary. She's my sister. She likes____ and dolls too. But we ____like toy cars and ____. We often____together.
一本练习册的厚度是0.60厘米,共计80张纸,则每张纸的厚度是____厘米,合____米.