如图是人体新陈代谢过程示意图请回答下列问题1把动脉血送回心脏的血管是肺静脉肺静脉2a系统吸收的营养物质是先流经b系统还是先 Template




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tomski如图是人体新陈代谢过程示意图请回答下列问题1把动脉血送回心脏的血管是肺静脉肺静脉2a系统吸收的营养物质是先流经b系统还是先 coloring