完成下列反映的方程式__+ Na2SO4=__+2NaNO3__+Na2CO3= __ +Caco3__+CO2= __
Did he fight with you yesterday?=__ __ __ __ __ __ __.
at once=__ __ __
完成下列化学方程式.(1)Na2CO3+____=2NaOH+_____(2)3NaOH+____=Fe(OH)3+__
I would like to buy my son books.=I __ __ __ __ __ __ __
(*^__^*)
__ Mary__ Lucy are my friends= __ __ Mary __ __ Lucy is my f
Her bike is different to yours=Her bike __ __ __ __ __ yours
in touch with=__ __ __ with
I am busy now.= I __ __ __ now.
What heavy box!=__ __ the box __!
Thank you anyway=Thank you __ __ __
有一个函数关系式y= -2x^2-x+2,常量有__,变量有__,自变量是__因变量是__,__是函数,__是__的函数