【单选题】His ____ change very quickly;one moment he's cheerful, and the next he's complaining about everything.
【单选题】室温时采用极性溶剂溶解的是哪种高聚物?( )
【单选题】室温时采用极性溶剂溶解的是哪种高聚物?()
【多选题】讯问犯罪嫌疑人、被告人必须要注意。
C.
讯问未成人犯罪嫌疑人、被告人要有合适的成年人在场
【单选题】When he moved to Canada, his children __________ the change very well.