锌铬黄(化学式:ZnCrO4)常用于制防锈涂料,锌铬黄中铬元素(Cr)的化合价是( )
--- What is your favourite sport? --- Swimming, I think. It's of all.
---I use your ruler, Lingling? --- Sure. Here you are.
--- Do you like watching TV? ---Yes, I. But only after I finish my homework.
Li Yan is my best friend. She comes a small village.
How is your father? Please say hello to ______ for me.