什么是文明生产？安全生产与文明生产是什么关系？

纯净物的化学式是经实验测定得出的。同学们设计以下甲、乙两组实验方案测定水的组成。

（1）甲方案中发生反应的化学方程式为          ，b端的气体是           。由产生气体的体积可推算出氢气与氧气的质量比为1：8，若氢、氧元素的相对原子质量分别为m和n，则水中氢、氧元素的原子个数比为               （用“m”或“n”表示）。 

（2）乙方案的实验过程中，B装置中可观察到           。若反应结束测得B装置减轻1.6g，则C装置增重的质量会           (填“大于”、“等于”或“小于”)1.8g。甲、乙方案的反应原理虽不同，但实验的设计依据都是                。

用适当的并列连词填空

1.  He couldn't know the truth about me,_____ he wouldn't treat me like this.

2.  The bell is ringing _____the lesson is over.

3. Although he was ill,_____he kept on working.

4.  I can't make up my mind _____we will go to Shanghai ______we will stay in our city.

5.  He doesn't talk much,_____he thinks a lot.

6.  It must have rained last night _____the ground is still wet.

7. The president will visit the town in May _____he will open the new hospital.

8. Jane was dressed in green _____Mary was dressed in blue.

9.  ______ he did not speak distinctly _____I did not hear it clearly.

10. He is clever,_______,he often makes mistakes.

11.  _____ did we write to her ______we called up her.

12. He hasn't any money ______I'm going to lend him some.

13. The child was sick;he,______,didn't go to school.

14. Mary was neither happy,_______was she sad.

15.  Put on more clothes,______ you'll catch cold.

(97～99题共用题干)
男性，30岁。5年来间断发作性上腹痛，常于进餐后1小时腹痛明显，伴反酸、嗳气， 3天来出现黑便，呈柏油样，上腹痛减轻。查体：BP 100/70mmHg，心率92次/分，律齐，上腹部轻压痛，肝脾肋下未触及。化验血Hb 92g/L，粪便隐血阳性。

引起该患者上消化道出血的最可能病因是

A．急性糜烂性胃炎

B．胃溃疡

C．胃癌

D．十二指肠溃疡

诊断特异度指的是（）

A.真阳性／（真阳性+假阳性）

B.真阳性／（真阴性+假阳性）

C.真阳性／（真阳性+假阴性）

D.真阴性／（真阳性+假阴性）

E.真阴性／（真阴性+假阳性）

保证梯形铧犁体工作稳定的水平间隙为（）。