题目如图为人体血液循环示意图请据图回答下列问题1血液在心脏和血管内按一定方�流动其动力来自 血液之所以不能倒流是由于有 ——青 Template




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tomski题目如图为人体血液循环示意图请据图回答下列问题1血液在心脏和血管内按一定方�流动其动力来自 血液之所以不能倒流是由于有 ——青 coloring