常用的轴瓦材料是（）A、轴承钢  B、巴氏合金  C、铝合金  D、铜合金

下列溶液中微粒的物质的量浓度关系正确的是（　　）

A．25℃时，0.1mol/LpH=4.5的NaHC₂O₄溶液：c（HC₂O₄^-）＞c（H₂C₂O₄）＞c（C₂O₄^2-）

B．NaHCO₃溶液：c（OH^-）=c（H⁺）+c（HCO₃^-）+2c（H₂CO₃）

C．25℃时，pH=9、浓度均为0.1mol/L的NH₃•H₂O、NH₄Cl混合溶液：c（NH₄⁺）+（H⁺）＞c（NH₃•H₂O）+c（OH^-）

D．0.1mol/L（NH₄）₂Fe（SO₄）₂溶液中：c（SO₄^2-）=c（NH₄⁺）＞c（Fe²⁺）＞c（H⁺）＞c（OH^-）

缺词填空（共10空；每空1分，计10分）

根据短文内容和首字母提示，在下文空格处填入适当的词使短文完整。（每空一词）

As you know , Mark Twain was a f ___小题1:____ writer . He was born in a poor family . It was difficult for him to get some money when he was young . One day , he was invited to give a talk and after that he was asked if he could r____小题2:_____ the first money he ever earned (挣). He had thought a long time before he answered and then said , “Yes , it was at school . I can remember e____小题3:_____ about it . Pupils in those days didn’t respect (尊敬) their teachers and didn’t take c­­___小题4:____ of school property (财产). Some of them often broke the windows and doors , the others cut something on the desks . S____小题5:____ a rule (规定)was made in our school that any boy who did that would be beaten (被打) in front of the whole school , or would have to p____小题6:_____ five dollars .”

“ One day I cut a mouse on the desk with a knife . I had to give five dollars to the school or be beaten before the w____小题7:____ school . So I had to tell my father about it . My father said it would be very bad to have our family disgraced(羞辱) in front of the whole school . He agreed to give me five dollars to hand over to the headmaster(校长).But before g____小题8:____ me the money , he took me upstairs(楼上) and gave me a beating . But as I had one beating and got used to(习惯) it , I d_____小题9:____ I would take another beating at school and leave the five dollars to m_____小题10:______ . So that’s what I did . That was the first money I ever earned .”

患儿，女，5岁，发热，伴肘膝大关节游走性肿痛10余天。查体：心音低钝，心率160/min，肝轻度肿大。实验室检查：抗“O”＞500U，血沉65mm/ h，诊断为风湿热合并心功能不全，请问应如何掌握洋地黄制剂的剂量

A．给一般剂量
B．给1/4～1/3
C．给1/3～1/2
D．给1/2～1/4
E．给足剂量

水痘发热后几日开始出皮疹（）。

A.半天

B.1天

C.2天

D.3天

E.5天

空气带升环流式发酵罐的工作原理？