下列哪一项不适宜施行甲状腺大部切除术()
A.中度原发性甲亢并发心律不齐
B.甲亢伴有气管压迫症状
C.青少年甲亢
D.继发性甲亢
E.单纯性甲状腺肿
参考答案:C
— Paul, could you please _____ the TV? It's too noisy.
— Sorry, I'll do it right now.[ ]
A. turn up
B. turn down
C. turning up
D. turning down
下列分离物质的方法中,根据微粒大小进行分离的是
A.萃取
B.重结晶
C.沉降
D.渗析