FeO在低温下不能稳定存在,当温度小于570℃时,将分解成().
参考答案:Fe3O4和αFe
根据句意完成句子。
1. I like to eat apples very much. The apple is my f_____________ fruit.
2. When you leave, please t_____________ o_____________ the lights in the classroom.
3. It is very hot now. Please t_____________ o_____________ the sweater, and p_____________
o_____________ the T-shirt.
4. He is a doctor. He works in the h_____________.
5. Look at the c_____________ on the wall. You can k_____________ the time.
完成句子。
1.下星期天有场篮球赛。
______ _______ _______ ______ ______ a basketball match next Sunday.
2. —学生们在做什么?
—有的在看书,有的在写字。
—What _______ the students _______?
—Some _______ _______ books, and some _______ _______.
3. —他们经常玩电脑游戏吗?
—是的。
—_______ they often ______ computer games?
—Yes, they _______.
4. 布朗先生明天从英国回来,是吗?
Mr Brown _______ _______ back from England tomorrow, _______ he?
5. 如果我下个星期六有空,我就陪你去看电影。
I _______ _______ to the cinema with you if I _______ free next Saturday.