皮皮学,免费搜题
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【简答题】
Nowadays more and more people rely on computers or cell phones to communicate. It has therefore become very easy for them to forget the stroke order when writing some characters. Thus, many hold that more importance should be attached to Chinese handwriting; but some hold it is not so necessary to advocate it anymore due to the convenience of electronic devices. What do you think? Please write an essay of about 400 words. You should supply an appropriate title for your essay. In the first part of your writing you should state clearly your main argument, and in the second part you should support your argument with appropriate details. In the last part you should bring what you have written to a natural conclusion or make a summary. Marks will be awarded for content, organization , grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.
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皮皮学刷刷变学霸
举一反三
【判断题】变性的蛋白质四级结构未改变
A.
正确
B.
错误
【单选题】在下列水溶液中进行的各反应中,在反应过程中既有离子键、极性键、非极性键断裂,又有离子键、极性键、非极性键生成的是(  )
A.
2NaBr+Cl 2 =2NaCl+Br 2
B.
2AgOH=Ag 2 O+H 2 O
C.
2Na+2H 2 O=2NaOH+H 2 ↑
D.
2Na 2 O 2 +2H 2 O=4NaOH+O 2 ↑
【单选题】是哈萨克青年们最喜爱的一种马上体育游戏,也是男女青年互表爱情的一种别致方式。
A.
姑娘追
B.
刁羊
C.
达瓦孜
D.
木卡姆
【单选题】()是哈萨克青年们最喜欢的马上体育游戏,也是男女青年相互表白爱情的一种别致方式。
A.
三月三
B.
姑娘追
C.
月亮节
D.
女儿节
【单选题】变性蛋白质分子结构肯定未改变的是( )
A.
一级结构
B.
二级结构
C.
三级结构
D.
四级结构
【单选题】下列化学反应中,既有离子键、极性键、非极性键断裂,又有离子键、极性键、非极性键形成的是 [     ]
A.
2Na 2 O 2 +2H 2 O=4NaOH+O 2 ↑
B.
Mg 3 N 2 +6H 2 O=3Mg(OH) 2 ↓+2NH 3 ↑
C.
Cl 2 +H 2 O=HClO+HCl
D.
NH 4 Cl+NaO NaCl+NH 3 ↑+H 2 O
【单选题】下列化学反应中,既有离子键、极性键、非极性键断裂,又有离子键、极性键、非极性键形成的是
A.
2Na 2 O 2 +2H 2 O=4NaOH+O 2 ↑
B.
Mg 3 N 2 +6H 2 O=3Mg(OH) 2 ↓+2NH 3 ↑
C.
Cl 2 + 2NaOH NaClO+NaCl+H 2 O
D.
NH 4 Cl+NaOH= NaCl+NH 3 ↑+H 2 O
【单选题】变性蛋白质分子结构未改变的是
A.
一级结构
B.
二级结构
C.
三级结构
D.
四级结构
E.
五级结构
【单选题】下列化学反应中,既有离子键、极性键、非极性键断裂,又有离子键、极性键、非极性键形成的是(  )
A.
2Na 2 O 2 +2H 2 O=4NaOH+O 2 ↑
B.
Mg 3 N 2 +6H 2 O=3Mg(OH) 2 ↓+2NH 3 ↑
C.
Cl 2 +H 2 O=HClO+HCl
D.
NH 4 Cl+NaOH═NaCl+NH 3 ↑+H 2 O
【简答题】“姑娘追”是()青年们最喜爱的一种马上体育游戏,同时可表白爱情。
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