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已知：①反应2FeCl 3 +SO 2 +2H 2 O=FeCl 2 +FeSO 4 +4HCl 和反应P 4 +5O 2 =2P 2 O 5 一样，都属于氧化还原反应；②离子方程式H + +OH - =H 2 O 一般可用来表示强酸和强碱发生中和反应的实质（生成的盐为能溶于水的强电解质）．请在由H、C、N、O、Na、Cl和Cu七种元素中任意组成的物质中选择适当的物质，回答以下问题： （1）写出一个有三种或三种以上物质发生的化合反应的方程式：______． （2）写出一个符合H + +OH - =H 2 O的化学方程式：______． （3）写出相对分子质量相等的分子式：______和______． （4）等纯度的多种氮肥中A的肥效最高．则90%的A中氮元素的质量分数为______． （5）H 2 O 2 不仅可以分解，它还有许多其它化学性质．在以下反应中，能够说明H 2 O 2 是一种二元弱酸的是______，H 2 O 2 中氧元素化合价仅升高的反应是______． A．Na 2 O 2 +2HCl=2NaCl+H 2 O 2 B．2Na 2 O 2 +2H 2 O=4NaOH+O 2 ↑ C．PbS+4H 2 O 2 =PbSO 4 +4H 2 O D．2KMnO 4 +3H 2 SO 4 +5H 2 O 2 =K 2 SO 4 +2MnSO 4 +5O 2 ↑+8H ′ O．
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参考答案：
举一反三
【单选题】学前教育阶段体育的重点是（ ）
A.
促进学生运动技术提高
B.
培养学生的体育文化素养
C.
促进学生动作技能的发展
D.
促进学生大脑的快速发育
查看完整题目与答案
【单选题】By the time I missed home so much that soup dumplings and sautéed eels popped up in my head as I read, Nietzsche had replaced Plato on the chronological reading list and Flaubert Homer.
A.
By the time I missed home so much that I started to lose my mind, I had expected to invite Nietzsche, Plato, Flaubert and Homer to taste soup dumplings and sautéed eels.
B.
By the time I missed home so much that I started to lose my mind, it seemed that Nietzsche had become Plato and Flaubert had become Homer.
C.
By the time I missed home so much that I started to lose my mind, it seemed that Nietzsche had replaced Plato and Flaubert had replaced Homer.
D.
By the time I missed home so much that I couldn’t help thinking about soup dumplings and sautéed eels, I had finished reading ancient authors like Plato and Homer and moved on to more modern authors like Nietzsche and Flaubert.
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【单选题】女性,49 岁,洗澡时发现右侧乳房外上肿块2 个月,自觉生长较快。体检:右侧乳房外上象限触及一约3.5cm×3cm×3cm 肿块,表面不光滑,边界不清,质硬。乳房局部皮肤凹陷呈“酒窝征”。右侧腋窝扪及2 个约蚕豆大小淋巴结,可推动。经活组织病理学检查证实为乳腺癌,拟行乳腺癌改良根治术。乳腺癌改良根治术的主要特点是
A.
保留乳头
B.
切除肿瘤保留乳房
C.
保留胸肌
D.
切除整个乳房
E.
切除乳房和部分肋骨
查看完整题目与答案
【单选题】— Why are you so late? I _____ for more than an hour. —  I'm terribly sorry. I overslept and missed the bus. [     ]
A.
am waiting
B.
was waiting
C.
have been waiting
D.
will be waiting
查看完整题目与答案
【简答题】学前教育阶段体育的重点是为后续的体育打下基础。()
查看完整题目与答案
【单选题】女性,49岁,洗澡时发现右侧乳房外上肿块2个月,自觉生长较快。体检:右侧乳房外上象限扪及一约3.5cm×3cm x 3cm肿块,表丽不光滑,边界不清,质硬。乳房局部皮肤凹陷呈“酒窝征”。右侧腋窝扪及2个约蚕豆大小淋巴结,可推动。经活组织病理学检查证实为乳腺癌,拟行乳腺癌改良根治术。乳腺癌改良根治术的主要特点是
A.
保留乳头
B.
切除肿瘤保留巍房
C.
保留胸肌
D.
切除整个乳房
E.
切除乳房和部分肋骨
查看完整题目与答案
【单选题】听力原文：W: If you hadn't driven fast enough, I would have missed my plane. M: Thanks to the short cut to the airport. Q: What does the man mean? (18)
A.
He was good at driving.
B.
He could drive very fast.
C.
He was able to avoid a traffic accident.
D.
He managed to take the shortest route.
查看完整题目与答案
【简答题】12 December Dear Manager, I'd like to apply for 1)___ (三天假), starting from the 13th and finishing on the 15th, in order to2) ___(回老家看望父亲),who is now staying in hospital. I should be very much obliged ...
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【简答题】作业要求: 在本学期拍摄练习作品中挑选10幅作品,配上标题或文字说明,每幅作品还需要有简短的分析介绍,使用PPT的形式提交。
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【多选题】从方框中所给的A、B、C、D、E五个选项中选出可以填入空白处的最佳选项,完成对话。 Lily: Hello! 11 Is Sue there? Billy: I’m sorry, Lily. Sue isn’t in right now. Lily: 12 Billy: I’m not quite sure. Probably sometime tonight. 13 Lily: Yes, tha...
A.
Yes, that would be great.
B.
You’re welcome.
C.
This is Lily speaking.
D.
Would you like me to give her a message?
E.
Do you know when she will be back?
查看完整题目与答案
相关题目：
【单选题】学前教育阶段体育的重点是（ ）
A.
促进学生运动技术提高
B.
培养学生的体育文化素养
C.
促进学生动作技能的发展
D.
促进学生大脑的快速发育
查看完整题目与答案
【单选题】By the time I missed home so much that soup dumplings and sautéed eels popped up in my head as I read, Nietzsche had replaced Plato on the chronological reading list and Flaubert Homer.
A.
By the time I missed home so much that I started to lose my mind, I had expected to invite Nietzsche, Plato, Flaubert and Homer to taste soup dumplings and sautéed eels.
B.
By the time I missed home so much that I started to lose my mind, it seemed that Nietzsche had become Plato and Flaubert had become Homer.
C.
By the time I missed home so much that I started to lose my mind, it seemed that Nietzsche had replaced Plato and Flaubert had replaced Homer.
D.
By the time I missed home so much that I couldn’t help thinking about soup dumplings and sautéed eels, I had finished reading ancient authors like Plato and Homer and moved on to more modern authors like Nietzsche and Flaubert.
查看完整题目与答案
【单选题】女性,49 岁,洗澡时发现右侧乳房外上肿块2 个月,自觉生长较快。体检:右侧乳房外上象限触及一约3.5cm×3cm×3cm 肿块,表面不光滑,边界不清,质硬。乳房局部皮肤凹陷呈“酒窝征”。右侧腋窝扪及2 个约蚕豆大小淋巴结,可推动。经活组织病理学检查证实为乳腺癌,拟行乳腺癌改良根治术。乳腺癌改良根治术的主要特点是
A.
保留乳头
B.
切除肿瘤保留乳房
C.
保留胸肌
D.
切除整个乳房
E.
切除乳房和部分肋骨
查看完整题目与答案
【单选题】— Why are you so late? I _____ for more than an hour. —  I'm terribly sorry. I overslept and missed the bus. [     ]
A.
am waiting
B.
was waiting
C.
have been waiting
D.
will be waiting
查看完整题目与答案
【简答题】学前教育阶段体育的重点是为后续的体育打下基础。()
查看完整题目与答案
【单选题】女性,49岁,洗澡时发现右侧乳房外上肿块2个月,自觉生长较快。体检:右侧乳房外上象限扪及一约3.5cm×3cm x 3cm肿块,表丽不光滑,边界不清,质硬。乳房局部皮肤凹陷呈“酒窝征”。右侧腋窝扪及2个约蚕豆大小淋巴结,可推动。经活组织病理学检查证实为乳腺癌,拟行乳腺癌改良根治术。乳腺癌改良根治术的主要特点是
A.
保留乳头
B.
切除肿瘤保留巍房
C.
保留胸肌
D.
切除整个乳房
E.
切除乳房和部分肋骨
查看完整题目与答案
【单选题】听力原文：W: If you hadn't driven fast enough, I would have missed my plane. M: Thanks to the short cut to the airport. Q: What does the man mean? (18)
A.
He was good at driving.
B.
He could drive very fast.
C.
He was able to avoid a traffic accident.
D.
He managed to take the shortest route.
查看完整题目与答案
【简答题】12 December Dear Manager, I'd like to apply for 1)___ (三天假), starting from the 13th and finishing on the 15th, in order to2) ___(回老家看望父亲),who is now staying in hospital. I should be very much obliged ...
查看完整题目与答案
【简答题】作业要求: 在本学期拍摄练习作品中挑选10幅作品,配上标题或文字说明,每幅作品还需要有简短的分析介绍,使用PPT的形式提交。
查看完整题目与答案
【多选题】从方框中所给的A、B、C、D、E五个选项中选出可以填入空白处的最佳选项,完成对话。 Lily: Hello! 11 Is Sue there? Billy: I’m sorry, Lily. Sue isn’t in right now. Lily: 12 Billy: I’m not quite sure. Probably sometime tonight. 13 Lily: Yes, tha...
A.
Yes, that would be great.
B.
You’re welcome.
C.
This is Lily speaking.
D.
Would you like me to give her a message?
E.
Do you know when she will be back?
查看完整题目与答案
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