The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.
Answer:
Japan knew the United States was economically and military powerful, but it was not afraid of any American attack on its islands. Japan did worry however, that the Americans might help the Chinese resist the Japanese invasion of their country. When President Roosevelt stopped U.S. shipments of steel and oil the Japan, he was doing exactly this: the Japanese are dependent on other countries for raw materials, for they have almost none on their own islands. Without imports of steel and oil, the Japanese military could not fight for long. Without oil, the navy would not be able to move after it had exhausted its six-month reserve. Roosevelt hoped that this economic pressure would force Japan to end its military expansion in East Asia.
The answer is Lan Tribes and Laundi Tribes.
Answer:
Ford introduced the assembly line for mass production of cars.
Explanation:
The assembly line in Henry Ford automobile industry supported him in mass production. The assembly lines allow workers and machines to complete particular tasks as assigned. Lines helped finish work in less time with fewer efforts by creating various work stations in one line. In the beginning, the Model T car was not mass production as it were expensive. To improve the production of cars, Ford introduced the assembly line, which helped to finish the product in short period.
By both looks muscle tone strength and fighting skill and pervouces job
