某同学设计了如下一组实验,取四朵用石蕊试液染成紫色的干燥纸花,分别按下图进行实验

题型:实验题

问题:

某同学设计了如下一组实验,取四朵用石蕊试液染成紫色的干燥纸花,分别按下图进行实验。回答下列问题:

(1)观察到纸花的颜色变化是:

I纸花变红;Ⅱ_____________;Ⅲ纸花不变色;Ⅳ________________。

(2)I实验说明了_______________;Ⅱ实验说明了________________;Ⅲ实验说明了_________________;

(3)上述四个实验说明了:______________________。

(4)写出实验Ⅳ中发生反应的化学方程式:___________________。

考点:二氧化碳的性质实验
题型:实验题

阅读理解。

    If you do not use your arms or your legs for some time, they become weak. When you start using them

again, they slowly become strong again. Everybody knows that. Yet many people do not seem to know that

memory works in the same way.

    When someone says that he has a good memory, he really means that he keeps his memory in practice by

using it. When someone else says that his memory is poor, he really means that he does not give it enough

chance to become strong.

    If a friend says that his arms and legs are weak, we know that it is his own fault (过错). But if he tells us

that he has a poor memory, many of us think that his parents are to be blamed (责备), and few of us know

that it is just his own fault.

    Have you ever found that some people can't read or write but usually they have better memories? This is

because they cannot read or write and they have to remember things; they cannot write them down in a little

notebook. They have to remember days, names, songs and stories; so their memory is the whole time being

exercised. So if you want to have a good memory, learn from the people: practice remembering.

1. Which of the following is right? [ ]

A. Your arms or your legs will become weak when you use them.

B. Your memory works in the same way as your arms and legs.

C. Everybody knows that memory works in the same way as their arms and legs.

D. Your memory can't become strong again when you use them again.

2. If you want to have a good memory, you must ______. [ ]

A. practice it

B. not give it enough chance to become strong

C. have clever parents

D. use your arms and legs often

3. One has a bad memory because of ______. [ ]

A. his own fault

B. his parents' fault

C. his teachers' fault

D. his strong arms and legs

4. Many people who can't read and write can remember things well because ______. [ ]

A. they have to remember

B. they can't write them down

C. they practice remembering

D. they can remember things quickly

5. The writer tells us ______. [ ]

A. a good memory comes from practice

B. a good memory needs strong arms and legs

C. parents can make us clever

D. to remember days, names and songs

题型:实验题

利用“验证玻意耳--马略特定律”的实验装置来验证查理定律.

(一)为了完成这个实验,除了图中给出的器材外,还需要气压计、托盘天平、热水、凉水和______.

(二)必须进行的实验步骤有:

(1)用托盘天平称出活塞和框架的质量M,用气压计读出实验室中的大气压强P0,按图安装器材,在框架两侧挂上钩码,使注射器的下半部分位于量杯之中,往量杯中加入适量的凉水,使注射器内的空气柱位于水面之下,过几分钟后,记下钩码的质量和活塞下面的位置,同时______.

(2)在量杯中加热水,过几分钟后在框架两侧挂适当质量的钩码,记下钩码的质量.同时______.

(3)把步骤2重复4次.

(三)可用作图法来验证查理定律是否成立,该图线的横坐标所代表的物理量及其单位是______纵坐标所代表的物理量及其单位是______.

题型:实验题

分子分散体系是一种()。

题型:实验题

主动脉听诊区闻及收缩期喷射样杂音,向颈部传导,最可能的诊断是()

A.二尖瓣狭窄

B.二尖瓣关闭不全

C.主动脉瓣狭窄

D.主动脉关闭不全

E.肺动脉瓣狭窄

题型:实验题

下列关于融资融券业务会计处理表述不正确的是()。

A、证券公司融出的资金,应当确认应收债权,并确认相应的利息收入

B、客户融入的资金,应当确认应付债务,并确认相应的利息费用

C、证券公司应终止确认融出的证券

D、证券公司对客户融资融券并代客户买卖证券时,应当作为证券经纪业务处理

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