【多选题】
克劳斯反应器床层温度的影响因素是___。
A. 反应器进口H2SSO2浓度变化
B. 催化剂活性
C. 反应器进口温度的变化
D. 系统压力的变化
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答案
ABC
解析
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相关试题
【多选题】
H2S/SO2在线分析仪发生故障，会产生___
A. H2S/SO2比值固定不变
B. 与采样分析的数据不一致
C. 尾气中二氧化硫含量上升
D. 副风不随 H2S/SO2比值的变化而变化
【多选题】
在酸气燃烧炉中发生的主要反应是___。
A. H2S＋1/2O2=1/2S2+H2O
B. CH4＋2O2=CO2＋2H2O
C. 2H2S＋3O2=2SO2＋2H2O
D. COS+H2O=CO2+H2S
【多选题】
锅炉煮炉在炉水中加入药剂，然后将炉水煮沸，使锅炉内金属表面的污垢和铁锈溶解疏松和脱落下来，以___。
A. 防止受热面腐蚀
B. 防止受热面过热
C. 保证炉水品质
D. 保证蒸汽的品质
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【单选题】
Of the following, are NOT among the categories of American higher education.
A. A. universities and colleges
B. B. research institutions
C. C. technical institutions
D. D. community colleges
【单选题】
Higher education in the United States began with the founding of
A. A. Yale University
B. B. Harvard University
C. C. Princeton University
D. D. New York University
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Of the following subjects, are NOT offered to elementary school students.
A. A. mathematics and languages
B. B. politics and business education
C. C. science and social studies
D. D. music and physical education
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Formal education in the United States consists of , secondary and higher education.
A. A. kindergarten
B. B. public
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At present, U. S. exports account for of the world’s total.
A. A. 10%
B. B. 15%
C. C. 20%
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is not one of the three giants in American automobile industry.
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【单选题】
The following statements are all true except .
A. A. Agribusinesses reflect the big, corporate nature of many farm enterprises.
B. B. Agribusinesses maintain a balanced trade pattern between agricultural imports and exports.
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About of American crops are for export.
A. A. half
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President Johnson tried to build a “Great Society” by introducing various programs like the following except .
A. A. Medicare
B. B. Food Stamps
C. C. Education Initiatives
D. D. Unemployment Pension
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The following inventions took place during the “second indThe following inventions took place during the “second industrial revolution” except .
A. A. typewriter
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D. D. refrigerator
【单选题】
The first National Bank of the United States was established with the urge of .
A. A. George Washington
B. B. Thomas Jefferson
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【单选题】
Chartered companies were NOT granted the by the British King or Queen.
A. A. political authority
B. B. economic rights
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【单选题】
The modern American economy progressed from to , and eventually, to .
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B. B. farming economy, handcraft economy, industrial economy
C. C. colonial economy, farming economy, industrial economy
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【单选题】
America produces a major portion of the world’s products in the following fields except .
A. A. machinery
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The President is directly voted into office by .
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The Supreme Court is composed of justices.
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The terms for a Senator and Representative are and years respectively.
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According to the Constitution, a candidate for President must be .
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【单选题】
The following except are all powers of the President.
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All the following except cannot make legislative proposal.
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The following except are guaranteed in the Bill of Rights.
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The Bill of Rights .
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【单选题】
The Constitution of the United States .
A. A. gives the most power to Congress
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The U. S. Constitution came into effect in .
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The characteristic of dominant American culture is .
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is located on the U. S. –Canadian border between Lake Erie and Lake Ontario.
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Some of the world famous universities like Harvard, Yale and MIT are located .
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