bad the weather is!
A:It's
B:What's
C:What
D:How
湿法制备的主要反应为:2Fe(OH)3+3ClO﹣+4OH﹣═2FeO42﹣+3Cl﹣+5H2O,
干法制备的主要反应为:2FeSO4+6Na2O2═2Na2FeO4+2Na2O+2Na2SO4+O2↑
下列有关说法不正确的是( )
I'm sorry to hear that your brother's ____ (break) his leg.