人類發展到今天,能力守恒仍然沒被打破。要省能源,必須車體輕,要車體輕,隻好用塑料,把車弄的體型很小, 或者偷工減料。
人類發展到今天,能力守恒仍然沒被打破。要省能源,必須車體輕,要車體輕,隻好用塑料,把車弄的體型很小, 或者偷工減料。
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