人类发展到今天,能力守恒仍然没被打破。要省能源,必须车体轻,要车体轻,只好用塑料,把车弄的体型很小, 或者偷工减料。
人类发展到今天,能力守恒仍然没被打破。要省能源,必须车体轻,要车体轻,只好用塑料,把车弄的体型很小, 或者偷工减料。
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