3.1 Benefits
Compared to other modes of transport, aircraft, there are many advantages
Speed. At present, the speed of jet about 900 km.
High mobility. Aircraft flying from the mountains, rivers, desert, ocean barrier, but according to passengers, the number of sources increase the number of flights at any time.
Safe and comfortable. According to ICAO statistics, civil aviation passenger kilometers per million the number of deaths was 0.04 people, the way an ordinary traffic accident deaths to a few of the several one-tenth of 1 percent, and rail transport as the most secure means of transport.
3.2 shortcomings
However, as a mode of transport aircraft has its own limitations
Very expensive. Whether it is flying the aircraft itself or the akoya pearls consumption of fuel compared with other mode of transportation more expensive.
Affected by weather freshwater pearls conditions. Although aviation technology has been able to adapt to pearl necklace the vast majority of weather conditions, but more serious wind, rain, snow, fog and other weather conditions will continue to affect the safety of aircraft taking off and landing.
Landing site is limited. Aircraft take-offs and landings must be at the airport, a city of at most a few airports, and airport clearance by surrounding conditions located in the suburbs. From the pearl jewelry airport to the city often requires a longer process of intermediation, which provides high-speed trains to 800 kilometers within the distance inter-city transport market space. Therefore only applies to aircraft weight, time and demands an urgent and can not be too close to a range of transport.
High mortality rate of emergency. Although the air passenger-km per million death toll is far lower than that of other transport equipment, but critics argue that the journey itself, the aircraft also transported other than a long, so I was driving down the value. In some data on the aircraft are not particularly safe. Aircraft cumbersome machines in most cases will lead to the tragic crash.
Coverage in the land of lush forest, is owned by a great nature and the most precious Green Fortune
Is the first human ancestors living in the forest. They cultured pearls rely on freshwater pearls collecting wild fruit, catch birds for food, with the leaves, skins do clothing, so the nest in the tree house was added to our catalog. The forest is home to human beings, human beings are here with jade jewelry the origin and Wholesale jewelry development.
Even today, the forest still provides us with the necessary production and living of the pandora jewelry various types of information. The world39s estimated 3 million people to the forest as their home, rely on forests to earn a living.
Provided by forests, including fruit, seeds, nuts, roots, tubers, fungi and other food, some forest areas in Thailand, 60 of the food from the forest. Forest bush in the back to provide people with meat animals and animal protein.
The use of a wide range of wood, a house built, the mines, repair railway bridge frame, paper, furniture … … forests provide to millions of employment opportunities. Also a variety of other forest products, resin, baked plastic, wax worms, spices, etc., are all the raw materials of light industry.
China and India has been the use of medicinal plants in history in 5000, today the majority of the world still rely on medicinal plants and forest access. In developed countries, 1 4 of the active pharmaceutical ingredients from medicinal plants.
Some developing countries, firewood is the main fuel. The world about 20 million people rely on firewood and charcoal for cooking. Such as Burundi, Bhutan and other countries, more than 90 of the energy provided by the forest.
May be said that the forest is like nature39s scheduling pilots, the nature of its regulation of air and water cycle, affecting climate change, protect the soil from wind and rain of abuse, to reduce environmental pollution hazards to the people.
Forests are worthy of being called lungs of the Earth , each tree is an oxygen generator and carbon dioxide absorber. Tiliaceae an 16 kilograms a day can absorb carbon dioxide, 150 hectares Yang, Liu, Huai and other broad-leaved forest one day can produce 100 tons of oxygen. If the share of urban residents on average 10 square meters per person per 25 square meters of trees or grass, they exhale carbon dioxide will have a place to go, what is needed has been the source of oxygen.
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