右图是血液循环和气体交换示意图请据图回答1心脏结构中心壁最厚的是 它是 循环的起点2图中的5是 血管内流 血血液只能 Template




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tomski右图是血液循环和气体交换示意图请据图回答1心脏结构中心壁最厚的是 它是 循环的起点2图中的5是 coloring