如图所示为水螅的纵切面和涡虫示意图,据图回答: 1 一图中食物由 进入;在 消化,食物残渣由 排出。 2水螅特有 Template




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tomski如图所示为水螅的纵切面和涡虫示意图,据图回答: 1 一图中食物由 coloring