Предмет: ОБЖ, автор: misterkey72

Ребята помогите пж . Какой спсоб защиты населения от селей самый эфективный​

Ответы

Автор ответа: nastiastar142006
2

Ответ:

Наиболее эффективные противоселевые меры:

Использование противоселевых систем (сетей и барьеров), останавливающих селевой поток и удерживающих каменный материал

misterkey72: можно с примерами
nastiastar142006: ща
nastiastar142006: например дамбы, много мешков с песком
misterkey72: больше примеров 8 примерно пж
nastiastar142006: высадка деревьев помогает предотвратить сели
nastiastar142006: щаща
nastiastar142006: мешки с песком, большие дамбы из камня или дерева, дамбы перенаправляющие движение потока, шаблонные конструкции
nastiastar142006: пока так
nastiastar142006: ещё поищу
misterkey72: спасибо
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The track is one of the basic features of a railway. It is also called the permanent way. The fact is that in the early days of railroad building the workers first had to lay temporary tracks to transport the materials to the construction site.
And only after that they laid down the permanent tracks on the permanent way, as it was called. The permanent way consists of rails, ties and ballast.
The railroad track of today is quite different from that used in the early days of railways.
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The ties on most tracks were almost all of wood and in order to make them last longer they were treated with creosote. The ties are not laid upon the earth for the earth cannot support the track structure. They rest upon a bed of crushed rock, or gravel, which is called ballast. Ballast supports the track structure, holds the track in position and provides needed drainage.
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What elements does the permanent way consist of?
What is the origin of the term permanent way?
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Why is the joint the weakest part of the track ?
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