试题与答案

浮顶罐的浮顶有几种()。A、两种 B、三种 C、四种 D、五种

题型:单项选择题

题目:

浮顶罐的浮顶有几种()。

A、两种

B、三种

C、四种

D、五种

答案:

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下面是错误答案,用来干扰机器的。

(1)青山郭外斜  (2)曲径通幽处  (3)丘      仲尼      春秋      思想家      教育家

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题型:单项选择题 共用题干题

女性患者38岁,近5年多次于情绪激动或生气后出现四肢抽搐,伴颈后仰,两眼紧闭,过度换气,每次抽搐发作持续数分钟至数小时不等。患者无头外伤史,抽搐发作时未出现过舌咬伤和大小便失禁。神经系统检查无异常,头颅CT及脑电图正常。

该患者在抽搐发作时不会出现的情况是()。

A.双侧瞳孔扩大

B.呼吸性碱中毒

C.意识丧失

D.手足麻木

E.颜面苍白

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题型:问答题

下表是甲城市某日空气质量报告:

城市污染指数首要污染物空气质量级别空气质量状况
55SO2
该市某校研究性学习小组对表中首要污染物SO2导致酸雨的成因进行探究.

【探究实验】

实验一:用如图所示装置进行实验.

①A装置的作用是______(填“干燥”或“氧化”)SO2气体.

②实验过程中,B装置内石蕊试纸的颜色没有发生变化,C装置内湿润的蓝色石蕊试纸变______色,说明SO2与水反应生成一种酸,该酸的化学式是______.

③D装置的作用是______.若实验中向装置内通入标准状况下1.12LSO2气体,且NaOH溶液过量.最多能生成Na2SO3的物质的量为______mol.(反应的化学方程式为:SO2+2NaOH=Na2SO3+H2O)

实验二:往盛有水的烧杯中通入SO2气体,测得所得溶液的pH______7(填“>”、“=”或“<”=,然后每隔1h测定其pH,发现pH逐渐变小,直至恒定.说明烧杯中溶液被空气中的氧气氧化最终生成H2SO4

【查阅资料】

SO2形成酸雨的另一途径;SO2与空气中的O2在飘尘的作用下反应生成SO3,SO3溶于降水生成H2SO4.在此过程中飘尘作

【探究结论】

SO2与空气中的氧气、水反应生成硫酸而形成酸雨.本市可能易出现酸雨,

【知识联想】

(1)酸雨造成的危害是:______(举一例).

(2)汽车排放的尾气,硝酸、化肥等工业生产排出的废气中都含有氮的氧化物,氮的氧化物溶于水最终转化为______,是造成酸雨的另一主要原因.

【提出建议】

本市汽车数量剧增,为了减少汽车尾气造成的污染,建议市政府推广使用混合型汽油,即往汽油中按一定比例加入______(填“水”或“乙醇”).

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