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横截面上扭矩等于任一侧所有力对轴线之矩的代数和
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Canada is the second largest country in the Western Hemisphere.
Canada is bounded on the north by the Arctic Ocean, on the west by the Pacific Ocean, and on the east by the Atlantic Ocean.
Most of the Canadian people live close to the US border in the south.
The highest peak in Canada is Mount Logan.
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