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【简答题】
能源“非石油化”是战略目标,发展以CH 4 、CO 2 等为原料的“C 1 化学”成为当今化工生产的必然趋势。通常天然气中含有H 2 S等有毒气体,下图为天然气合成氨的工艺流程。 (1)甲烷----氧气燃料电池是将________能转化为_______能的装置。CH 4 在空气中燃烧时,将干冷的小烧杯罩在火焰上方,可观察到烧杯内壁有________。 (2)CH 4 可合成多种无机物和有机物。研究CH 4 和CO 2 反应生成CO和H 2 ,重大意义在于______;我国科研人员首先发现CH 4 可直接分解获得C 6 H 6 和H 2 ,化学方程式为 ___________。 (3)①中CH 4 与H 2 O(气)反应生成CO 2 、H 2 ,化学方程式是___________。 ②中一般加入K 2 CO 3 溶液吸收CO 2 ,此反应表示为K 2 CO 3 +CO 2 +H 2 O==2_________,N 2 与H 2 按照分子数1:____反应生成NH 3 。 (4)使用Fe 2 O 3 ·H 2 O除去H 2 S,生成物中含硫元素的物质有______种。流程中参与循环的物质是_______(填化学式)。
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【单选题】机械制图中,剖视图按零件被剖切范围大小分为 。
A.
全剖、半剖和局部剖
B.
阶梯剖、旋转剖和斜剖
C.
全剖和半剖
D.
阶梯剖和旋转剖
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【单选题】Although one might not think so from some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very considerable proportion of the world...
A.
every potential consumer in the world
B.
large countries in the world
C.
people with a high standard of living
D.
a large number of people in the world
【单选题】Although one might not think so from some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very considerable proportion of the world...
A.
every potential consumer in the world
B.
large countries in the world
C.
people with a high standard of living
D.
a large number of people in the world
【简答题】给下列的问句选择合适的答语。 (     ) 1. How often do you eat cabbage? (     ) 2. How often do you play sports? (     ) 3. Are these peas? (     ) 4. Is this cabbage? (     ) 5. Do you like peas or onions? A. We pla...
【单选题】Although one might not think so from some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very considerable proportion of the world...
A.
every potential consumer in the world
B.
large countries in the world
C.
people with a high standard of living
D.
a large number of people in the world
【单选题】国际篮球联合会规定场地标准长度为多少米?
A.
25
B.
26
C.
27
D.
28
【简答题】选用正确的疑问词完称问句。 how many, how much, how long, how soon, how often 1. — ____ do you usually have an art lesson? — Twice a week. 2. — ____ will Tree Planting Day be? — In a week. 3. — ____ CDs have you go...
【单选题】Although one might not think so from some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very considerable proportion of the world...
A.
every potential consumer in the world
B.
large countries in the world
C.
people with a high standard of living
D.
a large number of people in the world
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