下列关于溶液的说法正确的是( ) A.溶液都是无色、透明的 B.溶液都是由一种溶

题型:选择题

问题:

下列关于溶液的说法正确的是(  )

A.溶液都是无色、透明的

B.溶液都是由一种溶质和一种溶剂组成的

C.溶液都是混合物

D.凡是均一稳定的液体都是溶液

考点:溶液的定义、组成及特征
题型:选择题

肝明显大,肝颈回流征阳性()

A.急性肝炎

B.肝淤血

C.肝硬化

D.脂肪肝

E.右下肺不张

题型:选择题

As a young girl, Margaret “Mattie” Knight never played with dolls, preferring to make toys for her brothers instead. In 1849, Knight went to work in a cotton factory where she witnessed a “shuttle,” a device that carries thread back and forth across a textile loom(纺布机), fly off the machine when the thread broke, striking and killing a young boy about her own age.

The 12-year-old Knight developed a safety mechanism that made it impossible for a shuttle to leave the loom. The design was so effective, soon virtually every new power loom carried her invention, saving countless workers from injury or death. Being so young, she didn’t bother to patent the device, so she never received payment.

Knight wouldn’t make the same mistake later in life when she invented a machine that could produce flat-bottomed paper bags. Knight had built a small wooden model in her home, but she needed a metal version to show it could hold up to the stress of mass production. So she hired Charles Annan to make the full-sized machine for her, only to have him try to claim the patent for himself. When Knight sued(起诉), Annan’s argument was that the design had to be his, because no woman could possibly understand the complex mechanics. Knight proved him wrong when she brought back her wooden prototype and explained how every part worked. She won the case in 1871, making her the second woman to hold an American patent. Over a hundred years later, her design is still used as the basis for many modern flat-bottom bag machines.

But that wasn’t the last the world heard of Mattie Knight. During her lifetime, she made about 90 inventions and received 26 patents, becoming one of the most productive female inventors of the 19th century.

小题1:We can learn from Paragraph 1 that ________.

A.Knight behaved like boys

B.Knight had an unhappy childhood

C.Knight did a poor job of making toys

D.Knight liked inventing things as a child小题2:What do we know about Knight’s first invention?

A.It is still used today.

B.It brought her great profit.

C.It was made when he was 20.

D.It reduced injuries at textile plants.小题3:Knight sued Charles Annan because he _______.

A.stole the wooden model for the machine she invented.

B.failed to make the full-sized machine for her

C.tried to patent her invention for himself

D.kept the metal version for himself小题4:What would be the best title for the text?

A.Mattie Knight’s fight for her patent

B.A great woman in the 19th century

C.“The female Edison”, Mattie Knight

D.Great inventions, great woman

题型:选择题

景观生态学中斑块形状有( )。

A.圆形

B.多边形

C.长条形

D.半岛形

E.环形

题型:选择题

为了避免IP地址的浪费,需要对IP地址中的主机号部分进行再次划分,再次划分后的IP地址的网络号部分和主机号部分则用什么来区分

A.IP地址

B.网络号

C.子网掩码

D.IP协议

题型:选择题

在pH7.4的碳酸盐-碳酸缓冲系统中,[HCO-3]/[H2CO3]的比值是()

A.1:20

B.20:1

C.1:10

D.10:1

E.5:1

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