下列做法错误的是( ) A.用干冰灭火 B.用生石灰作食品干燥剂 C.涂油漆防锈

题型:选择题

问题:

下列做法错误的是(  )

A.用干冰灭火

B.用生石灰作食品干燥剂

C.涂油漆防锈

D.用燃着的火柴检验煤气是否泄漏

考点:爆炸、自燃金属的锈蚀与防护生石灰的性质和用途二氧化碳的用途
题型:选择题

阅读理解。

     Long, long ago there was a very foolish thief. Do you know what he did one day? When he wanted

to steal (偷) the bell on his neighbour's door, he walked up to the door, took hold of (抓住) the bell and

pulled hard. The bell made a very loud noise. The thief was afraid and went home.

     Then he sat down to think, "I must do something about the noise," he said. He thought and thought.

At last he had an idea. "Ah, I'll put some cotton in my ears. Then I won't be able to hear the noise." The

next day he went to the door of his neighbour, and took hold of the bell. This time he pulled even harder.

The bell rang loudly, but the thief did not hear anything. With another hard pull he got the bell out. Just

then the neighbour came running out.

     "Steal my bell? I'll teach you a lesson (教训)," the angry man shouted. And he hit the thief on the

nose.

     The foolish thief did not know how the neighbour found out he was stealing the bell. "Why did he

come out just then?" he wondered (感到疑惑).

1. The thief was trying to get _____.

A. his neighbour                      

B. his neighbour's doorbell

C. some cotton                        

D. a door with a bell on it

2. The neighbour ran out probably (很可能) because _____.

A. he knew his doorbell was being stolen  

B. he thought someone was eager (渴望的)to visit him

C. He realized (意识到) something strange happened

D. Both B and C

3. Which of the following is TRUE?

A. The thief understood why he was hit on the nose.

B. The thief knew why the neighbour came out.

C. The thief thought the neighbour could not hear the bell.

D. The thief didn't want to know why the neighbour ran out just at the time he stole the doorbell.

题型:选择题

某科研小组分离出完整的叶肉细胞,一部分放在适宜条件下培养,能通过光合作用产生淀粉,另一部分搅碎后放在同样条件下培养,发现没有淀粉产生。

(1)此科研小组研究的内容属于生命系统中的_________水平。

(2)此实验的结论是________。

题型:选择题

张某,男,35岁,工人。痔疮便血2年。血常规:血红蛋白67g/L,MCV68fl,MCH20pg,总铁结合力70μmol/L,血清铁6μmol/L,转铁蛋白饱和度9.5%,现症见:面色苍白,唇甲色淡,头晕,疲乏,形寒肢冷,腰膝酸软,大便不成形,舌淡,脉沉细弱。

其西医诊断是()

A.巨幼红细胞贫血

B.再生障碍性贫血

C.缺铁性贫血

D.溶血性贫血

E.自身免疫性溶血性贫血

题型:选择题

某患者,不明原因,近年来进行性肥胖,半年来闭经就诊,查体:发现其向心性肥胖,面部、胸部都有痤疮,下腹部皮肤有紫纹,BP165/100mmHg,血糖85mmol/dl,血皮质醇46mg/dl。

CT见垂体腺瘤,双肾上腺轻度增生,最好的治疗方法是()。

A.肾上腺次全切除+垂体照射

B.肾上腺全切除+垂体照射

C.口服肾上腺皮质激素合成阻滞剂

D.经蝶窦切除垂体微腺瘤

E.经筛窦切除垂体微腺瘤

F.以上均不理想

题型:选择题

糖尿病的形成有多种原因,如下图所示①、②、③表示由三种机体免疫异常引起的糖尿病。请据图回答下列问题:

图中某类细胞是指()细胞,其产生的抗体Y1与胰岛B细胞上的受体结合,导致胰岛B细胞对()的敏感度降低,胰岛素的分泌量减少,血糖浓度升高。

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