A:从能量转换角度来看,框图中的氯碱工业是一个将电能转化为化学能的过程
B:过程②中结晶出的MgCl2·6H2O要在HCl氛围中加热脱水制得无水MgCl2
C:在过程③、⑤中溴元素被氧化
D:过程①中除去粗盐中的SO2-4、Ca2+、Mg2+、Fe3+等杂质,加入药品的顺序为:Na2CO3溶液→NaOH溶液→BaCl2溶液→过滤后加盐酸
“渔阳颦鼓动地来,惊破霓裳羽衣曲。”紧急的战报打破了唐玄宗与杨贵妃的歌舞升平。促使唐朝国势由盛转衰的是( )
Read and choose找出不同类的一项。
One day,a hungry and thirsty____sees some nice grapes. He likes grapes. They are purple and ____. But the grapes are high. The fox ____get and eat them. A bird can____the grapes. She likes the sweet grapes. They are yummy. The fox is ____and angry. He says those grapes are sour. They are not____.