重结晶
参考答案：
利用杂质和结晶物质在不同溶剂和不同温度下的溶解度不同，将晶体用合适的溶剂再次结晶，以获得高纯度的晶体的操作。
— Mike, what did our monitor say just now?
— Every boy and every girl as well as the teachers who _____ to visit the museum _____ asked to be at
the school gate before 6:30 in the morning. [ ]
A. is ; is
B. are; are
C. is; are
D. are; is
病人诉自己的血液凝固了，身体干枯了，变成了僵尸。该症状属于（）。
A.思维联想障碍
B.思维逻辑障碍
C.内脏幻觉
D.妄想
E.人格解体
