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【简答题】
I.目前,我国采用“接触法”制硫酸,设备如图所示: (1)图中设备A的名称是_____________,该设备中主要反应的化学方程式为 。 (2)有关接触法制硫酸的下列说法中,不正确的是_____(填字母序号)。 A.二氧化硫的接触氧化在接触室中发生 B.吸收塔用浓度为98.3%浓硫酸吸收三氧化硫 C.煅烧含硫48%的黄铁矿时,若FeS 2 损失了2%,则S损失2% D.B装置中反应的条件之一为较高温度是为了提高SO 2 的转化率 E.硫酸工业中在接触室安装热交换器是为了利用SO 3 转化为 H 2 SO 4 时放出的热量 II.纯碱是一种重要的化工原料。制碱工业主要有“氨碱法”(索尔维法)和“联合制碱法”(制碱法)两种工艺。请按要求回答问题: (3)CO 2 是制碱工业的重要原料,“联合制碱法”中CO 2 的来源于 ,“氨碱法”中CO 2 来源于 。 (4)氨碱法的原子利用率(原子利用率=期望产物的总质量与生成物的总质量之比) 。 (5)写出“联合制碱法”有关反应的化学方程式: 。
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参考答案:
举一反三
【单选题】对发绀的描述,你认为下列哪项是错误的
A.
发绀是指血中还原血红蛋白增多
B.
广义的发绀还包括高铁血红蛋白血症和硫化血红蛋白血症
C.
中心性发绀可分为:肺性发绀和心性混合性发绀
D.
周围性发绀可分为:瘀血性和缺血性周围性发绀
E.
真性红细胞增多症所致发绀不属于周围性发绀
【单选题】Living with Computer After too long on the Net, even a phone call can be a shock. My boyfriend's Liverpudlian accent suddenly becomes hard to understand after the clarity of his words on screen; a sec...
A.
obscure.
B.
distinct.
C.
unreal.
D.
misleading.
【简答题】完形填空。 Now we live in the 'computer age'. People like scientists, teachers, writers and even students use computers to do much 1 . But more than 30 years ago, 2 couldn't do much. They were very big and...
【单选题】Living with Computer After too long on the Net, even a phone call can be a shock. My boyfriend’s Liverpudian accent suddenly becomes hard to understand after the clarity of his words on screen; a secr...
A.
obscure.
B.
distinct.
C.
unreal.
D.
misleading.
【简答题】阅读理解。 Chinese people are now living happier and longer than before. According to the latest study, the number of people over 60 years old is 130 million, up 10 percent of the whole population, ...
【单选题】Methods and techniques used to examine cost and technical data are called feasibility studies. The economic aspects of a feasibility study include interest rates, present worth factors, operating cost...
A.
. Capitalization costs.
B.
. Technical skill requirements.
C.
. Technology forecasting.
D.
. Strategic marketing intelligence.
E.
. All of the above.
【单选题】下列哪项不是中心性发绀的原因
A.
严重呼吸道梗阻
B.
先天性心脏病
C.
严重休克
D.
肺部病变
E.
胸膜病变
【判断题】A stud has two ends, they are nut end and metal end
A.
正确
B.
错误
【判断题】Bolt, stud ,screw ,nut and washer are the commonly used fasteners
A.
正确
B.
错误
【判断题】钻孔的质量检查包括孔的中心位置、孔径、孔深等指标。
A.
正确
B.
错误
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