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【简答题】
绿矾( FeSO 4 ·7H 2 O )、硫酸铵以相等物质的量混合可制得摩尔盐晶体，反应原理为: (NH 4 ) 2 SO 4 + FeSO 4 + 6H 2 O =(NH 4 ) 2 SO 4 ·FeSO 4 ·6H 2 O↓。 其流程可表示为: (1)洗涤中Na 2 CO 3 的主要作用是____________ 。 (2)结晶过程中要加热蒸发溶剂，浓缩结晶。应加热到_____________时，停止加热。 (3)过滤是用图14所示装置进行的，这种过滤跟普通过滤相比，除了过滤速度快外，还有一个优点是____________ 。 (4)用无水乙醇洗涤的目的是____________ 。 (5)产品中Fe 2+ 的定量分析:制得的摩尔盐样品中往往含有极少量的Fe 3+ 。为了测定摩尔盐产品中Fe 2+ 的含量，一般采用在酸性条件下KMnO 4 标准液滴定的方法。称取4.0g的摩尔盐样品，溶于水，并加入适量稀硫酸。用0.2 mol/LKMnO 4 溶液滴定，当溶液中Fe 2+ 全部被氧化时，消耗KMnO 4 溶液10.00mL。 ①本实验的指示剂是___________ 。(填字母) A. 酚酞 B.甲基橙C.石蕊D.不需要 ②产品中Fe 2+ 的质量分数为______________ 。
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举一反三
【简答题】One important factor that affects the correctness of the results is that _________.
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【判断题】蜜柚具有降血糖的功能,适用糖尿病人。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Later, as one went on to apply for more important jobs, one was advised to include in the letter ______.
A.
something that would distinguish one from other applicants
B.
hinted information about the personality of the applicant
C.
one's advantages over others in applying for the job
D.
an occasional trick with the aggressive approach
查看完整题目与答案
【多选题】税收政策是财政政策工具之一。对税收政策的运用，以下说法正确的是（ ）。
A.
在经济繁荣时期，政府通过降低税率、实行更多税收优惠来鼓励投资，保持经济平稳
B.
在经济萧条时期，政府通过调高所得税超额累进税率的起征点，来减少高收入者可支配收入，促进公平
C.
在经济繁荣时期，政府通过调高税率、减少税收优惠等措施减少个人和企业的可支配收入，降低社会总需求。
D.
在经济萧条时期，政府通过降低税率、增加税收优惠等措施增加个人和企业的可支配收入，刺激社会总需求
查看完整题目与答案
【简答题】过渡高科技风格,又称“ ”,是一种对具有工业化特征的高科技风格的冷嘲热讽、戏 谑和调侃,具有高度的个人表现特点。
查看完整题目与答案
【判断题】蜜柚具有降血糖的功能，适用糖尿病人。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Later, as one went on to apply for more important lobs, one was advised to include in the letter ______.
A.
something that would attract attention to one's application
B.
a personal opinion about the organization one was trying to join
C.
something that would offend the person reading it
D.
a lie that one could easily get away with telling
查看完整题目与答案
【单选题】Later, as one went on to apply for more important jobs, one was advised to include in the letter ______.
A.
something that would attract attention to one's application
B.
a personal opinion about the organization one was trying to join
C.
something that would offend the person reading it
D.
a lie that one could easily get away with telling
查看完整题目与答案
【单选题】Later, as one went on to apply for more important jobs, one was advised to include in the letter______.
A.
something that would attract attention to one's application
B.
a personal opinion about the organization one was trying to join
C.
something that would amuse the person reading it
D.
a lie that one could easily get away with telling
查看完整题目与答案
【单选题】通过缩减政府的支出，或者减少企业和个人的可支配收入的紧缩性的财政政策是 （ ）
A.
盈余财政政策
B.
赤字财政政策
C.
平衡财政政策
D.
货币发行政策
查看完整题目与答案
相关题目：
【简答题】One important factor that affects the correctness of the results is that _________.
查看完整题目与答案
【判断题】蜜柚具有降血糖的功能,适用糖尿病人。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Later, as one went on to apply for more important jobs, one was advised to include in the letter ______.
A.
something that would distinguish one from other applicants
B.
hinted information about the personality of the applicant
C.
one's advantages over others in applying for the job
D.
an occasional trick with the aggressive approach
查看完整题目与答案
【多选题】税收政策是财政政策工具之一。对税收政策的运用，以下说法正确的是（ ）。
A.
在经济繁荣时期，政府通过降低税率、实行更多税收优惠来鼓励投资，保持经济平稳
B.
在经济萧条时期，政府通过调高所得税超额累进税率的起征点，来减少高收入者可支配收入，促进公平
C.
在经济繁荣时期，政府通过调高税率、减少税收优惠等措施减少个人和企业的可支配收入，降低社会总需求。
D.
在经济萧条时期，政府通过降低税率、增加税收优惠等措施增加个人和企业的可支配收入，刺激社会总需求
查看完整题目与答案
【简答题】过渡高科技风格,又称“ ”,是一种对具有工业化特征的高科技风格的冷嘲热讽、戏 谑和调侃,具有高度的个人表现特点。
查看完整题目与答案
【判断题】蜜柚具有降血糖的功能，适用糖尿病人。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Later, as one went on to apply for more important lobs, one was advised to include in the letter ______.
A.
something that would attract attention to one's application
B.
a personal opinion about the organization one was trying to join
C.
something that would offend the person reading it
D.
a lie that one could easily get away with telling
查看完整题目与答案
【单选题】Later, as one went on to apply for more important jobs, one was advised to include in the letter ______.
A.
something that would attract attention to one's application
B.
a personal opinion about the organization one was trying to join
C.
something that would offend the person reading it
D.
a lie that one could easily get away with telling
查看完整题目与答案
【单选题】Later, as one went on to apply for more important jobs, one was advised to include in the letter______.
A.
something that would attract attention to one's application
B.
a personal opinion about the organization one was trying to join
C.
something that would amuse the person reading it
D.
a lie that one could easily get away with telling
查看完整题目与答案
【单选题】通过缩减政府的支出，或者减少企业和个人的可支配收入的紧缩性的财政政策是 （ ）
A.
盈余财政政策
B.
赤字财政政策
C.
平衡财政政策
D.
货币发行政策
查看完整题目与答案
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