A:冰不是晶体
B:冰的熔点是0℃
C:冰水混合态的温度一定在0摄氏度以上
D:冰在熔化过程中吸收热量,温度升高
下图为我国古代朝代更替示意图的某一片断。图中①②③代表的朝代分别是( )
)向炭粉、Cu和Fe2O3组成的混合粉末中加入一定量的稀硫酸,充分反应后过滤,得到溶液A,将沉淀物洗涤、干燥,得到固体B.
John was dismissed last week because of his ________attitude towards his job. ( )