19.如图是血液循环和体内气体交换示意图“ → 表示血液在血管内流动的方�“ 表示气体运动的方�.请根据图回答1心脏四个腔中图 Template




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tomski19.如图是血液循环和体内气体交换示意图“ → 表示血液在血管内流动的方�“ coloring