历史文献学

水是维系生命的基础物质之一．自然界的水因含有多种杂质而不能直接饮用．自来水厂净水过程可示意为：

（1）加入絮凝剂（明矾）的作用是______；

（2）目前很多自来水厂用氯气进行消毒．消毒过程中常会发生如下化学反应，其反应的微观过程可用下图表示：

写出图甲所示反应的化学方程式______．

（3）小军将新制的氯气通入紫色石蕊试液中，惊奇地发现试液先变红，接着就褪色了．他查阅资料得知新制的氯水具有漂白性．为探究溶液褪色的原因，他设计了几个实验：

【实验准备】：用紫色石蕊试液浸泡几朵小纸花，并晾干；加热少量新制的氯水，冷却后灌入喷壶．

实验Ⅰ	实验Ⅱ	实验Ⅲ	实验Ⅳ	实验Ⅴ
喷稀盐酸	喷水	直接放入氯气中	喷水后放入氯气中	喷加热后的氯水

【实验现象】：①实验Ⅰ：______②实验Ⅱ、Ⅲ：紫花不变色 ③实验Ⅳ：紫花先变红后褪色 ④实验Ⅴ：紫花变红，不褪色．

【实验结论】：新制氯水中具有漂白性的物质是______．

顺序阀属于（）。

A、方向控制阀

B、压力控制阀

C、流量控制阀

D、运动控制阀

以下肠痈的病因，哪一项是错误的：（）

A.饮食不节

B.寒温不适

C.忧思抑郁

D.房劳过度

E.跌仆损伤

某工厂发生火灾事故，经评估，事故中造成直接经济损失120万元，工人的伤亡情况为死亡0人，重伤10人，轻伤18人。则评估的该事故的严重度为( )万元。

A．226.30
B．326.30
C．386
D．500

You probably won’t be shocked to find out that the inventor of tire rubber is Charles Goodyear, as he’s the only guy on the list to actually get his name attached to the end product. (46) It wasn’t easy coming up with a form of rubber tough enough to withstand the drag racing and car chases everyone envisioned the day the automobile was invented. In fact, if there was one man who should have given up his life dream, it was Goodyear. (47)The man spent time in and out of prison, lost every friend he had and starved his children in his tireless pursuit of a per form of rubber.

(48) After his first two years of tinkering and failing with primitive rubber in the 1830s, Goodyear and his family were camping out in an abandoned factory and fishing for sustenance. This is when he made a huge breakthrough: He’d use acid to smooth out and toughen rubber! The government bought 150 mailbags made of the stuff and the rest is...

Oh, wait. They were all defective. The process didn’t work and Goodyear was ruined. Again.

Finally in 1839, Goodyear wandered into a general store with another failure of a formula. The crowd watched and laughed at him. (49)In a rage, he began to shake his fist, flinging a piece of his rubber onto the hot stove top.

After inspecting the charred remains, he realized that he had just found a way to make durable, weatherproof rubber. (50) Despite what we’re sure were numerous failed "now let’s try setting this on fire to see if it improves it!" experiments, an empire was born.

(46) It wasn’t easy coming up with a form of rubber tough enough to withstand the drag racing and car chases everyone envisioned the day the automobile was invented.