下列离子方程式书写正确的是 A.AlCl3溶液与过量的浓氨水:Al3++4NH3

题型:选择题

问题:

下列离子方程式书写正确的是

A.AlCl3溶液与过量的浓氨水:Al3++4NH3·H2O=AlO2+4NH4++2H2O

B.向Ca(ClO)2溶液通入过量的CO2:Ca2++2ClO+CO2+H2O=CaCO3↓+2HClO

c.溴化亚铁溶液中通入足量的氯气:2Fe2+ +2Br+ 2Cl2=2Fe3+ + Br2 +4Cl

D.CuSO4溶液与少量的Ba(OH)2溶液: Cu2++ SO42—+Ba2++2OH=Cu(OH)2↓+BaSO4

考点:离子方程式
题型:选择题

"Opt-out" mechanism is probably ______

A.a machine that can be attached to your computer

B.a button that you can make a choice to read or not to read

C.a software that you can play a computer game

D.an e-mail that says some good words to you

题型:选择题

经纬仪由照准部、()和基座三部分组成。

A.垂直度盘

B.望远镜

C.支架

D.水平度盘

题型:选择题

短文改错。

    假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文

中共有10处语言错误,每句中最多两处。错误涉及一个单词的增加、删除或修改。

     增加:在此处加一个漏字符号(∧),并在其下面写出修改的词。

     删除:把多余的词用斜线(\)划掉。

     修改:在错的词下划一横线,并在其下面写出修改后的词。

     注意:1.每处错误及其修改均仅限一词;

                 2.只允许修改10处,多者(从十一处起)不计分。

Dear Andy,

    I am glad to learn that you or some of your classmates are coming to Hangzhou and you will stay at

my home. My parents and I are very pleasing to have you with us. Now let me to tell you what we have

arranged for yourself. I know the school would organize a lot things for you to do in the morning. And in

the afternoon, I'll show you around and take you to some places of interests, like the West Lake,

Qianjiang New City and so on. We'll most stay at home in the evening watching TV, playing games and

meeting people. I'm sure you'll have a wonderful time here. I'm looking forward very much to meet you

soon.

________________________________________________________________________________

题型:选择题

激光打印成像,胶片曝光利用的是()。

A.紫外线

B.激光束

C.电子线

D.阴极射线

E.软X射线

题型:选择题

哪个键用来拖放时将选择区复制到另一幅图像?()

A.Shift

B.Alt

C.Ctrl

D.Delete

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