有Fe2++H++NO3-→Fe3++NH4++H2O这样一个变化过程,下列叙述

题型:选择题

问题:

有Fe2++H++NO3-→Fe3++NH4++H2O这样一个变化过程,下列叙述不正确的是(    )

A.氧化剂和还原剂的物质的量之比为1:8

B.该过程说明Fe(NO3)2溶液不宜加酸酸化

C.每1 mol NO3-发生氧化反应,转移8 mol 电子

D.若把该反应设计为原电池,则负极反应为Fe2+- e- = Fe3+

考点:氧化还原反应与基本反应类型的关系氧化还原反应的本质和特征氧化还原反应的配平氧化还原反应的表示方法
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某元素的原子最外电子层排布是6s26p4,该元素或其化合物不可能具有的性质是(  )

A.该元素单质可能是导体

B.该元素的最高化合价呈+6价

C.该元素能与氢气反应生成气态氢化物

D.该元素单质形成的晶体晶胞是简单立方

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--- Now where was I ?

--- You ______ me about your travels in Canada.

A.told

B.were telling

C.have told

D.will tell

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液压式合模系统和液压-机械式合模系统各有何特点?

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国家对哪些企业实行安全生产许可证制度?

题型:选择题

Almost everyone likes dogs, and almost everyone likes to read stories about dogs.
I have a friend. He has a big police dog named Jack. Police dogs are very clever. Every Sunday afternoon my friend takes the dog for a long walk in the park. Jack likes these long walks very much.
One Sunday afternoon, a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack out for a walk. But the visitor still stayed. Jack became very worried. He walked around the room several times and then sat down in front of the visitor and looked at him. But the visitor paid no attention. He went on talking. At last Jack got angry. He went out of the room and came back a few minutes later. He sat down again in front of the visitor, but this time he took the visitor’s cap in his mouth.

______ likes the long walks very much.

A. My friend

B. Jack


C. A young man

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