①pH=3的CH3COOH溶液;②pH=3的HCl溶液;③pH=11的氨水;④p

题型:选择题

问题:

①pH=3的CH3COOH溶液;②pH=3的HCl溶液;③pH=11的氨水;④pH=11的NaOH溶液。相同条件下,有关上述溶液的比较中,错误的是 [ ]

A. 将②、③溶液混合后,pH=7,消耗溶液的体积:②>③

B. ①④等体积混合后,溶液显碱性

C. 等体积的①、②、④溶液分别与足量铝粉反应,生成H2的量①最大

D. 向溶液中加入100mL水后,溶液的pH:③>④>②>①

考点:弱电解质的电离溶液的酸碱性
题型:选择题

如果人站在月球上,眼睛看见地球是一个球体,无法分辨出细节,用放大2000倍的光学显微镜可以看到地球上的楼房,如果用放大1亿倍的纳米扫瞄隧道显微镜,可以看到水泥墙和泥土里的沙粒。这一事实说明  [ ]

A.当今人们的认识能力是无限的   

B.新的认识工具和手段推动认识的发展   

C.实践中的新问题会推动实践的发展   

D.人们对客观世界的认识进一步深化和扩展

题型:选择题
用下列方框中所给动词(组)的适当形式填空: (每小题1分,共7分) 
witness,   adjust,   cut out,   cover,    comfort,    remind… of,    flee
 
1. The governor demanded that all the homeless children __________________ by psychologists after the earthquake.
2. My camera can ________________________to take pictures in cloudy or sunny conditions. 
3. —Who is the man talking to Mr. Smith, the host of Shanghai TV?
— A local journalist ______________________ the earthquake and Tsunami in Japan.
4. —I told you to bring a dictionary with you before school was over.
—I am sorry, but this morning I was in such a hurry that I forgot _____________________ that.  
5. The year 2010 __________________increasing unemployment in that country as a result of global economic crisis.
6. Many people were said to _____________to the hills to escape the fighting between different political parties.
7. This passage is too long. In my opinion, these four sentences require _______________.
题型:选择题

用最少的劳动消耗和物资消耗,生产出最多的产品,就叫做()

A、经济效益

B、生产效益

C、管理效益

D、人员效益

题型:选择题

涉身认知的基本思想是什么?

题型:选择题

铁路客运职工职业道德之一勤恳敬业,做到()。

A.工作勤奋、业务熟练

B.团结协作、密切配合

C.细心周到、主动热情

D.服从命令、执行标准

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