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（12分）关于“铝热反应”的现象有这样的描述：“反应放出大量的热，并发出耀眼的光芒。”“纸漏斗的下部被烧穿，有熔融物落入。”又已知Al、Fe 2 O 3 、Al 2 O 3 、F e的熔点和沸点，如下表所示： （1）某同学推测，铝热反应得到的熔融物应是铝铁合金。理由是：该反应放出的热能使铁熔化，而铝的熔点比铁的低，放出的热也可使铝熔化，此时液态的铝形成铝铁合金。你认为这位同学的解释合理吗？__________（填“合理”或“不合理”）。 （2）设计一个简单的实验方案证明上述所得的熔融物中含有金 属铝，并填写下列表格： 所用试剂 实验操作及现象 有关反应的化学方程式 （3）实验室欲溶解此熔融物，下列试剂中最好的是________（填序号），理由是__________________________________________________________________。 A．MgCl 2 溶液 B．稀硫酸 C．浓硝酸 D．NaOH溶液
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【单选题】听力原文：Narrator Listen to a conversation between two students after a science class. Student A Hi, Nicolas! Student B Hi, Peter! Todays science class, by the way, how do you like it? Student A Its reall...
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Biology is an exact science.
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【简答题】听下面一段材料，回答第1-4题。 1. Why are people interested in vegetable gardening? A. Because people can make money from it. B. Because people can relax themselves. C. Because people can sell vegetables. 2. In wha...
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市区游乐场的室外游泳池
B.
工矿区内的砖瓦石灰窑
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建制镇内的房屋
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房地产开发企业开发的待售商品房
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【单选题】( )既可用来描述用例的工作流程,也可以用来描述类中某个方法的操作行为。
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顺序图
B.
状态图
C.
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【简答题】本次作业为互评作业 2. 3 月12日16:30分提交作业截止,然后系统开始分发互评作业,每人两份,双盲,互评意见建议为简短的书面意见。 3. 同伴可以评分,但是仅供参考。本次作业的最终得分以老师评分为准。 作业的具体写作要求如下: Write an email to one of the keynote speakers at the conference to ask if he or she...
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【单选题】W: How did you do with your essay for Professor Black Scott7 M:__________
A.
Everything is OK. But I failed to finish it.
B.
Professor Smith Scott didn' t work successfully enough to let me believe in him.
C.
Nonsense. It' s not your business.
D.
Not too bad， it took me almost 10 hours.
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【判断题】人的安全知识和技能是天生的
A.
正确
B.
错误
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【简答题】读完这本书,你是不是已经按捺不住心中的冲动,想为改变这个世界做些什么。别着急,一天试着做一件事,坚持下去,那么你的每一天都将会充满意义。那么我们通过哪些方式可以将理念化为行动呢?
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【单选题】W： How did you do with your essay for ProfessorBlack Scott? M：__________
A.
Everything is OK. But I failed to finish it.
B.
Professor Smith Scott didn’ t work successfully enough to let me believe in him
C.
Nonsense. It, s not your business.
D.
Not too bad, it took me almost 10 hours.
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【简答题】A．He agrees with the woman. B．He is a good lecturer himself. C．He is fond of Professor Smith. D．He partly agrees with the woman.
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相关题目：
【单选题】听力原文：Narrator Listen to a conversation between two students after a science class. Student A Hi, Nicolas! Student B Hi, Peter! Todays science class, by the way, how do you like it? Student A Its reall...
A.
Biology is an exact science.
B.
Robotics is a branch of science.
C.
Science may also bring about disasters.
D.
Science is knowledge of facts and laws.
查看完整题目与答案
【简答题】听下面一段材料，回答第1-4题。 1. Why are people interested in vegetable gardening? A. Because people can make money from it. B. Because people can relax themselves. C. Because people can sell vegetables. 2. In wha...
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【单选题】下列各项属于房产税征税范围,应纳房产税的是()
A.
市区游乐场的室外游泳池
B.
工矿区内的砖瓦石灰窑
C.
建制镇内的房屋
D.
房地产开发企业开发的待售商品房
查看完整题目与答案
【单选题】( )既可用来描述用例的工作流程,也可以用来描述类中某个方法的操作行为。
A.
顺序图
B.
状态图
C.
交互概览图
D.
活动图
查看完整题目与答案
【简答题】本次作业为互评作业 2. 3 月12日16:30分提交作业截止,然后系统开始分发互评作业,每人两份,双盲,互评意见建议为简短的书面意见。 3. 同伴可以评分,但是仅供参考。本次作业的最终得分以老师评分为准。 作业的具体写作要求如下: Write an email to one of the keynote speakers at the conference to ask if he or she...
查看完整题目与答案
【单选题】W: How did you do with your essay for Professor Black Scott7 M:__________
A.
Everything is OK. But I failed to finish it.
B.
Professor Smith Scott didn' t work successfully enough to let me believe in him.
C.
Nonsense. It' s not your business.
D.
Not too bad， it took me almost 10 hours.
查看完整题目与答案
【判断题】人的安全知识和技能是天生的
A.
正确
B.
错误
查看完整题目与答案
【简答题】读完这本书,你是不是已经按捺不住心中的冲动,想为改变这个世界做些什么。别着急,一天试着做一件事,坚持下去,那么你的每一天都将会充满意义。那么我们通过哪些方式可以将理念化为行动呢?
查看完整题目与答案
【单选题】W： How did you do with your essay for ProfessorBlack Scott? M：__________
A.
Everything is OK. But I failed to finish it.
B.
Professor Smith Scott didn’ t work successfully enough to let me believe in him
C.
Nonsense. It, s not your business.
D.
Not too bad, it took me almost 10 hours.
查看完整题目与答案
【简答题】A．He agrees with the woman. B．He is a good lecturer himself. C．He is fond of Professor Smith. D．He partly agrees with the woman.
查看完整题目与答案
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