解分式方程：34-x+2=1-xx-4．

So seriously _____ that he had to stop playing in the football match. [ ]

A. his feet were hurt

B. were hurt his feet

C. hurt were his feet

D. were his feet hurt

细菌性肺炎合并胸腔积液的患者，强烈提示胸腔积液的病因与肺炎无关的检查是（）

A.胸腔积液蛋白45g/L

B.胸腔积液有核细胞计数大于10000×10⁶/L

C.胸腔积液葡萄糖0.4mmol/L

D.胸腔积液有核细胞分类示单个核细胞占80%

E.胸腔积液LDH250U/L

He slipped and had his leg broken. _____, he will have    to be away from school for two

or three months.      [ ]

A. In any case                    

B. After all    

C. As a result                  

D. In this way

用振荡脱气装置脱气时，振荡室内温度应控制在（）。

A、50±1℃；

B、51±1℃；

C、54±1℃。

TN系统有如下那几种类型？（）

A、TN－C－S系统；

B、TN－C系统；

C、TN－P系统；

D、TN－S系统