如图为心脏工作中某一时刻的示意图请据图回答1血液循环的动力器官是心脏写出图中下列标号的结构名称a D 2血液只能由按一定 Template




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tomski如图为心脏工作中某一时刻的示意图请据图回答1血液循环的动力器官是心脏写出图中下列标号的结构名称a d 2血液只能由按一定 coloring