在马歇尔稳定度试验时的温度愈高，则稳定度愈大，流值愈小。

     In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist,

so he invented a very simple camera. He put it in a window of his house and took a picture of his garden.

That was the first photo.

     The  next  important  date  in  the  history of photography (摄影) was in 1837. That year, Daguerre,

another Frenchman, took a picture of his reading room. He used a  new  kind  of  camera in a different

way. In his picture you could see everything very clearly, even the smallest thing. This kind of photo was

called Daguerreotype.

     Soon, other people began to use Daguerre's way. Travelers brought back wonderful photos from all

around the world. People took pictures of famous buildings, cities and mountains.

     In about 1840, photography was developed. Then photographers could take pictures of people and

moving things. That was not simple. The photographers had to carry a lot of  film  and  other  machines.

But this did not stop them, for example, some in the United States worked so hard. Mathew Brady was

a famous American photographer. He took many pictures of great people. The pictures were unusual

because they were very lifelike (栩栩如生的).

     Photography also became a kind of art by the end of the 19th century. Some photos were not just

copies of the real world. They showed ideas and feelings, like other art forms.

1. Who took the first photo?

   __________________

2. The Daguerreotype was a kind of photo, wasn't it?

   __________________

3. If a photographer wanted to take pictures of moving things in 1840, what did he have to do?

   __________________

4. Why was Mathew Brady famous?

   __________________

5. When did photography become a kind of art?

   __________________

男性。25岁，发热，牙龈出血，皮肤瘀点、瘀斑5天，胸骨压痛明显，肝脾不大。HGB70g／L，WBC50×10⁹／L，PLT20×10⁹／L，骨髓增生极度活跃，原始细胞0．9，POX（-），PAS阳性呈粗颗粒状，非特异性酯酶阴性，血清溶血菌酶正常，诊断为（）

A.急性粒细胞白血病

B.急性早幼粒细胞白血病

C.急性单核细胞白血病

D.急性红白血病

E.急性淋巴细胞白血病

下列四幅图中锁反映的物理现象，符合发电机原理的是

A．甲图中，通电导线附近小磁针收到次厂里的作用发生偏转

B．乙图中，闭合开关，通电导线在磁场中将受到磁场力的作用而发生运动

C．丙图中，闭合开关，导体在磁场中水平左右移动时，电流表指针会发生偏转

D．丁图中，磁铁靠近发光的灯泡L，发现其灯丝在不停的晃动

患者女，58岁。做饭时突发意识不清，左侧肢体无活动，排尿、排粪失禁。到达急诊室时，患者曾有呕吐，但中午明显抽搐。既往有“风湿性心脏病”史；平时无基础用药。入院时体格检查：血压145/64mmHg，昏迷，左侧瞳孔直径略大于右侧，对光反射迟钝，颈无抵抗；心脏听诊示心房颤动心律，心率101次/min，心尖区可闻及舒张期隆隆样杂音，左侧病理征阳性。

该患者可能的诊断是（）

A.脑出血

B.蛛网膜下腔出血

C.大面积脑栓塞

D.脑血栓形成

E.肿瘤卒中

什么叫短时过热爆管？