根据人的心脏结构回答问题.1在心脏的心房与心室之间心室与动脉之间都有能开闭的 这一结构保证了血液按一定方�流动血液只能从心房流� Template




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tomski根据人的心脏结构回答问题.1在心脏的心房与心室之间心室与动脉之间都有能开闭的 这一结构保证了血液按一定方�流动血液只能从心房流� coloring