微分方程y''+y'=0的通解为( ) A．y=Ce-x B．y=e-x+C

问问想用图所示的器材，设计一个可以测量小灯泡电阻的电路。请你用笔画线代替导线，帮问问把图中的器材连接起来。

要求：①滑动变阻器的滑片向右2，灯泡的亮度变暗；②用电流表测灯泡的电流（灯泡的电阻约为10），电压表测灯泡两端电压。

（1）文文连完最后一根导线后就发现两个表的指针发生偏转，并且指针总在晃动，造成上述现象的原因分别为①__________________________②__________________________。

（2）此实验中滑动变阻器有两个作用：一是________________；二是___________________。

（3）下表是文文牛出的一份实验报告。

①将报告中其他空白补充完整。②本实验报告不够完整，还应添加的基本项目是________。③分析“实验步骤”中存在的主要缺陷是____________。④实验中，要尽量缩短通电时间，并用____(选填“较大”或“较小”)的电流来测量，因为这样做可以防止____________________________。

Nodira, 18, lives in the Tashkent region of Uzbekistan. She was born with a rare disease and is now paralyzed(瘫痪) from the waist down. Her life is confined to a wheelchair but her dreams know no such boundaries. Her hopes for the future include attending university, riding in her father’s car and being able to walk like other children.

Nodira, which means ‘unique’ in Uzbek, is one of five children in a poor family. Every morning, after reciting her prayers, Nodira feeds the hens and goats from her wheelchair. The rest of her day is spent knitting for other people and helping her mother with the household chores.

Nodira has never been to school because it is too far from her home and inaccessible for her wheelchair. A local teacher used to come and tutor her at home and, as a result, she was able to finish third grade. After that, her parents moved to another town and the tutor could not visit as much.

Despite the many difficulties in Nodira’s life she is lucky to be living with her family. The stigma(羞辱) attached to the children living with disabilities, combined with the lack of wheelchair access in schools and the economic difficulties faced by many Uzbek families, have led many parents to place children with disabilities in special institutions.

These days, Nodira does homework exercises at home and reads as much as she can. Still, it is unlikely that she will be able to finish her primary education, much less attend university. While missing out on an education is a great disappointment to Nodira, her greatest wish, for a true friend, can still come true. “What I want more than anything is a friend who also has a disability,” she says. “Somebody will not feel sorry for me or make fun of me, and will understand what my life is like.”

小题1:The underlined sentence in the first paragraph probably means “_____”.

A．her dreams will help her desert her wheel chair

B．her dreams are never limited by her disability

C．she often dreams of moving freely without a wheel chair

D．she never dreams of recovering from her disability小题2:Nodira does all the following every day EXCEPT _____.

A．give food to some animals

B．to make clothes from woolen or cotton thread

C．drive cars designed for the disabled

D．help with the housework小题3:The underlined word “tutor” in the 3rd paragraph can be replaced by “_____”.

A．educate

B．visit

C．treat

D．comfort小题4:What Nodira wants most is ______.

A．to go to university

B．to walk on her own feet

C．to finish her primary education

D．to find a true friend

当设计常年最高地下水位低于地下工程底板标高，又无形成滞水可能时，可不作防水处理。( )

甲公司所聘会计师事务所和律师事务所在明知甲公司有巨额负债没有披露的情况下，分别出具了隐瞒该情况的财务报告和法律意见书。这些行为构成

A．内幕交易行为

B．操纵市场行为　

C．欺诈客户行为

D．虚假陈述行为

结422焊条和结507焊条适于焊接哪些钢材？