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Metallurgical process is a process of reaction.
A.organic
B.physical
C.chemical
D.--
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- · 有4位网友选择 C,占比50%
- · 有3位网友选择 B,占比37.5%
- · 有1位网友选择 A,占比12.5%
A.organic
B.physical
C.chemical
D.--
A、hanger
B、glass
C、slipper
D、pillow
A、the bond is sold at a price to generate capital gains.
B、the bond is sold at a price on the constant-yield price trajectory.
C、coupon payments are reinvested at a rate higher than the original yield-to-maturity.
D、空
Within fifteen years Britain and other nations should be well on with the building of huge industrial complexes (结合)for the recycling of waste. The word "rubbish" could lose its meaning because everything that goes into the dumps would be made into something useful. Even the most dangerous and unpleasant wastes would provide energy if nothing else. The latest project is to take a city of around half a million inhabitants and discover exactly what raw materials go into it and what go out. The aim is to find out how much of these raw materials could be provided if a plant for recycling waste were built just outside the city. This plant would recycle not only metal such as steel, lead and copper, but also paper and rubber. Another new project is being set up to discover the best ways of sorting and separating the rubbish. When this project is complete, the rubbish will be processed like this: first, it will pass through sharp metal bars which will tear open the plastic bags in which rubbish is usually packed; then it will pass through a powerful fan to separate the lightest elements from the heavy solids; after that grounders and rollers break up everything that can be broken. Finally the rubbish will pass under magnets, which will remove the bits of iron and steel; the rubber and plastic will then be sorted out in the final stage. The first full-scale giant recycling plants are, perhaps, fifteen years away. Indeed, with the growing cost of transporting rubbish to more distant dumps, some big cities will be forced to build their own recycling plants before long. 1. The main purpose of the passage is ________. A. to show us a future way of recycling wastes B. to tell the importance of recycling wastes C. to warn people the danger of some wastes D. to introduce a new recycling plant 2. How many stages are there in the recycling process? A. 3. B. 4. C. 5. D. 6. 3. What is the main reason for big cities to build their own recycling plants? A. To deal with wastes in a better way. B. It’s a good way to gain profits. C. It’s more economical than to dump wastes in some distant places. D. Energy can be got at a lower price. 4. The first full-scale huge recycling plants ________. A. have been in existence for 15 years B. takes 15 years to build C. can’t be built until 15 years later D. will remain functioning for 15 years |
Thousands of years ago man used handy rocks for his surgical operations.Later he used sharpbones or horns, metal knives and more recently, rubber and plastic.In the 1960s a new tool wasdeveloped, one which was, first of all, to be of great practical use to the armed forces and indus-try, but which was also to revolutionize the art and science of surgery.
The tool is the laser and it is being used by more and more surgeons all over the world.As weall know, light is hot, and any source of light will give warmth.But light is usually spread outover a wide area.The light in a laser beam, however, is concentrated.This means that a light withno more power than that produced by an ordinary electric light bulb becomes intensely strong as itis concentrated to a pinpoint-sized beam.
Experiments with these pinpoint beams showed researchers that different energy sources pro-duce beams that have a particular effect on certain living cells.It is now possible for eye surgeonsto operate on the back of human eye without harming the front of the eye, simply by passing a laserbeam right through the eye-ball.Operations which once left patients exhausted and in need of longperiod of recovery time now leave them feeling relaxed and comfortable.
The rapid development of laser techniques in the past ten years has made it clear that the futureis likely to be very exciting.Perhaps some cancers will be treated with laser in a way that makessurgery not only safer but also more effective.
Which of the following would be appropriate to describe the instruments of surgical opera-tions up until 1960s? 查看材料
A.Traditional.
B.Complicated.
C.Remarkable.
D.Revolutionary.
A、Where do I go for help?
B、How do I know when the task is complete?
C、What are the rules?
D、Who reports to whom?
A、Biodegradable wasters
B、Dry waster
C、The waster of electrical and electronic
D、--
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