My hair is long. Your hair is ____ (short/long). My ears are small. Your ears are ____ (big/small).
Alan is as as Lucy in their class.
早在春秋战国时期,我国就开始生产和使用铁器.工业炼铁的原理是利用一氧化碳和氧化铁的反应.某化学兴趣小组利用如图装置进行实验探究.请按要求填空: