题目:
简述SDH网管SMN的分层结构和各层完成的主要功能。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:车速;换档阀
简述SDH网管SMN的分层结构和各层完成的主要功能。
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0929/6ff2ae82cee3a82ebc3b5866dadf383a.html
下面是错误答案,用来干扰机器的。
参考答案:车速;换档阀
病历摘要:患者,女性,21岁,不慎跌倒右手着地致伤右上臂后疼痛、畸形、活动受限。查体:右上臂中段成角畸形肱骨连续性中断,右桡动脉搏动细弱,右手拇指背伸不能,伸腕肌力Ⅲ级,其余(-)。
该患者的正确诊断是()
A.右肱骨中下1/3骨折合并桡神经、肱动脉损伤
B.右肱骨中下1/3骨折
C.右肱骨中下1/3骨折合并正中神经损伤,肱动脉损伤
D.右肱骨中下1/3骨折合并尺神经损伤、肱动脉损伤
下列( )不属于法律规定的保修范围。
A.因使用不当造成的损失
B.因施工问题造成的质量缺陷
C.因设计缺陷造成的质量缺陷
D.因材料问题造成的质量缺陷
实验结束后将变蓝的叶片做成切片,放在显微镜下观察,发现变成蓝色的是( )
A.叶肉细胞
B.保卫细胞
C.保卫细胞和叶肉细胞中的叶绿体
D.表皮细胞中的叶绿体
阅读理解。
What will power your house in the future? Nuclear, wind, or solar power? According to scientists at
the Massachusetts Institute of Technology (MIT) in the US, it might be leaves -but artificial ones.
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光
合作用). Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special
silicon chip (硅片) with catalysts (催化剂). Similar to natural leaves, it can split water into hydrogen
and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a
fuel cell (电池), which uses those two materials to produce electricity, located either on top of a house
or beside the house.
Though the leaf is only about the shape of a poker card, scientists claimed that it is promising to be an
inexpensive source of electricity in developing countries. "One can imagine villages in India and Africa not
long from now purchasing an affordable basic power system based on this technology," said Docera at a
conference of the American Chemical Society.
An artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive
and unstable for practical use. The new leaf, by contrast, is made of cheap materials, easy to use and
highly stable. In laboratory studies, Nocera showed that an artificial leaf prorotype (原型) could operate
continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera's recent discovery of several powerful new,
inexpensive catalysts. These catalysts make the energy transformation (转换) inside the leaf more
efficient with water and sunlight. Right now, the new leaf is about 10 times more efficient at carrying out
photosynthesis than a natural one. Besides, the device can run in whatever water is available; that is, it
doesn't need pure water. This is important for some countries that don't have access to pure water.
With the goal to "make each home its own power station" and "giving energy to the poor", scientists
believe that the new application could be widely used in developing countries, especially in India and
rural China.
1. Which of the following order correctly shows how the artificial leaf is used to produce electricity?
a. artificial leaves split water into hydrogen and oxygen
b. the hydrogen and oxygen gases are stored in a fuel cell
c. the artificial leaves are put in water
d. the fuel cell uses hydrogen and oxygen to produce electricity
A. cbad
B. cabd
C. bcad
D. cadb
2. Which of the following statements about new artificial leaves is TRUE according to the article?
A. They are inexpensive but unstable.
B. They are as efficient at carrying out photosynthesis as natural leaves.
C. They can work only in pure water.
D. They need several catalysts to help them work efficiently.
3. The aim of the scientists at MIT in developing the new artificial leaves is to .
A. build-up more power stations in the world
B. provide cheaper energy for developing countries
C. offer people in developing countries access to pure water
D. gain a deeper understanding of the photosynthesis process
4. What is the main point of the article?
A. Introduction to the history of artificial leaves.
B. An invention copying photosynthesis.
C. Giving energy to the poor.
D. A mixture of water power and solar energy.
毗连区是毗连其领海的区域,其宽度从领海外沿量起不超过24海里。