A. white B. orange C. pencil D. pen E. green
Hi, I'm Lucy. I have a pencil box. It's ____ I have a ____ It's black. I have an eraser. It's ____ I have a ____ It's red. I have a crayon. It's____
下列对原核生物的正确叙述是
用所学知识回答下列问题.
当x=-1时,代数式|5x+2|和代数式1-3x的值分别为M、N,则M、N之间的关系为( )