第1个回答 2009-11-29
With corn-like plant to do the new plastics, biopolymers, easily degradable, energy-saving environmental protection, but also in quality will not fall.
First, professor said that degradation occurs only under certain conditions, but also very difficult to meet all of the conditions: to be warm, or at least keep a week, there is no heat, and moisture, then use the traditional plastic, and as long as the time to degradation. Second, in order to do biopolymers, first kinds of corn and other raw materials, while agriculture is extremely energy-intensive and polluting the environment exactly (because farmers use pesticides and other chemical substances). Third, the quality will be inferior, such as to save the CD and other things, to durable, and biopolymers in the heat and moisture will degrade under the apparently impossible.
Writing is the first question is about the decline in the number of birds. According to the article because of human activity
First, the increase in the number of human caused human constantly expand their own district, squeezing the birds space.
Second, the number of human growth mean to the growth in demand for agriculture. Led to a lot of forest, wetlands and grassland birds such as living area was cleared for farmland.
Third, the development of agriculture resulted in large-scale use of pesticides, a number of birds died of poisoning, even if the birds eat it alive, but also affect their ability to reproduce.本回答被提问者采纳
第2个回答 2009-11-29
Use corn plants do such as new plastic, biopolymers, easy-to-energy saving and environmental degradation, and quality will not be dropped.
First, the professor said degradation occurs only under certain conditions, and it's hard to meet all the conditions are true: you want to keep warm, at least a week, there is no heat and moisture, and traditional plastic you want to use the same length of time to degradation. Secondly, in order to make biopolymers, complete the kind of corn, and agricultural raw materials is extremely precisely where the pollution of the environment and energy consumption (because farmers use pesticides and other chemicals. third, the quality will be inferior, such as what you will store your CDs, to durable, heat and moisture biopolymers to degrade under clearly could not be patented.
Writing the first question is about the decline in the number of birds.Article considers to be the cause of human activities
First, the growing number of human caused constantly expand their own district, extrusion birds.
Second, human growth means on agricultural demand growth.Many forest, grassland and other wetlands and living area will be opened up for the birds to farmland.
Thirdly, the development of agriculture cause massive use of pesticides, some birds poisioning, even if the birds ate does not die, but also affect their ability to reproduce.
第3个回答 2009-11-29
With corn-like plant to do the new plastics, biopolymers, easily degradable, energy-saving environmental protection, but also in quality will not fall.
First, professor said that degradation occurs only under certain conditions, but also very difficult to meet all of the conditions: to be warm, or at least keep a week, there is no heat, and moisture, then use the traditional pesticides and other chemical substances). Third, the quality will be inferior, such as to save the CD and other things, to durable, and biopolymers in the heat and moisture will degrade under the apparently impossible.
Writing is the first question is about the decline in the number of birds. According to the article because of human activity
First, the increase in the number of human caused human constantly expand their own district, squeezing the birds space.
Second, the number of human growth mean to the growth in demand for agriculture. Led to a lot of forest, wetlands and grassland birds such as living area was cleared for farmland.
Third, the development of agriculture resulted in large-scale use of pesticides, a number of birds died of poisoning, even if the birds eat it alive, but also affect their ability to reproduce.