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【单选题】
在制硫酸的工业中有以下反应： 2SO 2 （g）+O 2 (g) 2SO 3 （g）  ΔH＜O,下列说法错误的是(    )
A.
生产中通入过量的空气，可以提高二氧化硫的转化率
B.
生产中选择400—500 ℃，不仅能加快反应速率而且催化剂的活性好
C.
根据实际情况在生产中选择常压，可以提高综合经济效益
D.
在接触室被氧化生成的三氧化硫，进入吸收塔被水吸收制成硫酸
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举一反三
【单选题】Some firms have cut workers’pay below the level set in their contract, a _______ that is illegal in Germany.
A.
habit
B.
tradition
C.
practice
D.
training
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【单选题】Ad man Rosser Reeves believes that firms should develop a USP for each brand and stick to it. For what does USP stand?
A.
unique selling proposition
B.
universally strategic practice
C.
unique services practice
D.
unique sales pitch
E.
unique selling product
查看完整题目与答案
【简答题】相同情况下,AM、DSB-SC、SSB、VSB、FM这5种调制系统中,有效性最好的是_______,有效性最差的是_______,可靠性最好的是______。
查看完整题目与答案
【单选题】It is stated in the passage that__________.
A.
the United States is the first country to practice public relations
B.
some public relations firms have only one person
C.
there are more public relations firms in the U.S. than in any other place in the world
D.
a large percentage of employees in public relations work in profit-oriented sectors.
查看完整题目与答案
【判断题】AM, DSB-SC, SSB, VSB can use coherent demodulation.
A.
正确
B.
错误
查看完整题目与答案
【简答题】Wall Street firms have traditionally compensated their traders with a share of the trading profits that they generated. How might this practice have affected traders’ willingness to assume risk? What ...
查看完整题目与答案
【单选题】The MM theory with taxes implies that firms should issue maximum debt. In practice, this does not occur because
A.
debt is more risky than equity
B.
bankruptcy is a disadvantage to debt.
C.
the weighted average cost of capital is inversely related to the debt-equity ratio.
D.
the weighted average cost of capital is directly related to the debt-equity ratio.
查看完整题目与答案
【判断题】为了提高AM系统的调制效率,可采用DSB-SC调制;为了提高DSB-SC系统的有效性,可采用SSB调制;SSB设备复杂,存在技术难点,而VSB调制的滤波器较容易设计。
A.
正确
B.
错误
查看完整题目与答案
【判断题】DSB-SC、常规AM、SSB、及VSB系统的系统增益均是解调增益的一半。
A.
正确
B.
错误
查看完整题目与答案
【判断题】DSB-SC、常规AM、SSB、及VSB系统的系统增益均是解调增益的一半。
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】Some firms have cut workers’pay below the level set in their contract, a _______ that is illegal in Germany.
A.
habit
B.
tradition
C.
practice
D.
training
查看完整题目与答案
【单选题】Ad man Rosser Reeves believes that firms should develop a USP for each brand and stick to it. For what does USP stand?
A.
unique selling proposition
B.
universally strategic practice
C.
unique services practice
D.
unique sales pitch
E.
unique selling product
查看完整题目与答案
【简答题】相同情况下,AM、DSB-SC、SSB、VSB、FM这5种调制系统中,有效性最好的是_______,有效性最差的是_______,可靠性最好的是______。
查看完整题目与答案
【单选题】It is stated in the passage that__________.
A.
the United States is the first country to practice public relations
B.
some public relations firms have only one person
C.
there are more public relations firms in the U.S. than in any other place in the world
D.
a large percentage of employees in public relations work in profit-oriented sectors.
查看完整题目与答案
【判断题】AM, DSB-SC, SSB, VSB can use coherent demodulation.
A.
正确
B.
错误
查看完整题目与答案
【简答题】Wall Street firms have traditionally compensated their traders with a share of the trading profits that they generated. How might this practice have affected traders’ willingness to assume risk? What ...
查看完整题目与答案
【单选题】The MM theory with taxes implies that firms should issue maximum debt. In practice, this does not occur because
A.
debt is more risky than equity
B.
bankruptcy is a disadvantage to debt.
C.
the weighted average cost of capital is inversely related to the debt-equity ratio.
D.
the weighted average cost of capital is directly related to the debt-equity ratio.
查看完整题目与答案
【判断题】为了提高AM系统的调制效率,可采用DSB-SC调制;为了提高DSB-SC系统的有效性,可采用SSB调制;SSB设备复杂,存在技术难点,而VSB调制的滤波器较容易设计。
A.
正确
B.
错误
查看完整题目与答案
【判断题】DSB-SC、常规AM、SSB、及VSB系统的系统增益均是解调增益的一半。
A.
正确
B.
错误
查看完整题目与答案
【判断题】DSB-SC、常规AM、SSB、及VSB系统的系统增益均是解调增益的一半。
A.
正确
B.
错误
查看完整题目与答案