小明同学在总结酸、碱、盐之间的相互反应关系时发现，选用适当物质既可实现如图中所示

发布时间：2017-07-19 16:56 │ 来源：www.tikuol.com

题型：选择题

问题：

小明同学在总结酸、碱、盐之间的相互反应关系时发现，选用适当物质既可实现如图中所示的所有反应．若中间的物质为硫酸钡，那么对酸、碱、甲盐、乙盐四种物质的推断中，合理的是（　　）

A．HCl NaOH BaCl₂Na₂SO₄

B．HCl Ba（OH）₂Na₂SO₄BaCl₂

C．H₂SO₄Ba（OH）₂Na₂SO₄BaCl₂

D．H₂SO₄NaOH BaCl₂Na₂SO₄

考点：物质的鉴别复分解反应物质的推断

题型：选择题

完形填空。

     "Eyes are windows of the soul." Everyone knows the  1  of the eyes.  2 more and more students are
becoming near-sighted (近视). So how to protect the eyes is still a serious problem. Here is some advice
on  3 protect your eyesight (视力).
     You should not keep your eyes  4  for a long time. When reading, you should keep the books about a foot
away from you. After reading for an hour  5  two, you'd better have a  6 by looking into the distance (远处).
     You must remember not to read in dark light or in  7 , not to read on a moving bus or in bed. Doing eye
exercises will help  8  to protect your eyesight.
     In a  9 , to keep  10 eyesight, we must have good studying habits.

( )1. A. importance
( )2. A. So
( )3. A. what to
( )4. A. working
( )5. A. and
( )6. A. talk
( )7. A. the earth
( )8. A. him
( )9. A. word
( )10. A. bad

B. experience
B. Because
B. how to
B. walking
B. or
B. rest
B. the star
B. us
B. sentence
B. good

C. difference
C. But
C. when to
C. waking
C. as
C. by
C. the sun
C. you
C. letter
C. weak

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题型：选择题

下列说法正确的是（　　）

A．标准状况下，1 mol水的体积是22.4 L

B．1 mol氢气所占的体积一定是22.4 L

C．标准状况下，6.02×10²³个Cu原子所占有的体积约是22.4 L

D．标准状况下，28 g N₂与CO的混合气体，体积为22.4 L

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题型：选择题

外国银行在美国发行的可转让定期存单称为( )。

A．扬基定期存单

B．亚洲美元存单

C．武士定期存单

D．欧洲美元存单

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题型：选择题

CRH3型动车组牵引变流器的冷却方式为油冷和风冷的组合冷却方式。（）

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题型：选择题

艾滋病的临床期分为四个阶段，分别是（）期、（）期、（）期和（）期。

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