下表列出了除去物质中所含少量杂质的方法,其中错误的是 物质所含杂质除去杂质的方法 ACO2O2通过灼热的铜网 BKOH溶液K2CO3加入足量稀盐酸至不再产生
古诗词默写:(每道横线一分,共8分。) (1)、 ,悠然见南山。 (2)、 ,夜吟应觉月光寒。 (3)、剪不断
有甲、乙、丙三种金属,将甲投入丙的硫酸盐溶液中,有丙析出。将乙、丙两种金属分别投入硫酸铜溶液中,丙的表面有红色物质析出,乙的表面没有
下列每组加点字的注音均有一个错误,请选出并纠正读音,写在后面括号中 (1)A.踱步(duó) B.深邃(suì) C.萝卜(bǔ) D.揩油(kǎi) (
已知cos+sinα=,则sin的值为________.
Audrey Hepburn (奥黛丽·赫本) was born on May 4, 1929 in Brussels, Belgium. She really was blue-blood from the beginning with her father, a wealthy English banker, and her mother, a Dutch noblewo
下列词语中加点的字,读音全都正确的一组是 A.款识(zhì) 楔子(xiē) 叨(tāo)光 倾诉心曲(qū) B.籼米(xiān) 佣金(yōng
(2010·安徽师大附中高三二模) 29. —What do you think of Spain? —Well, considering its diverse cultures, it is an attractive country,______ worthy of a visit. A. it