在做观察蚯蚓的实验时同学们�现蚯蚓的体表是有黏液的这有利于蚯蚓 A.吸收营养 b.保持水分c.进行�吸 d.在土壤中运动 Template




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tomski在做观察蚯蚓的实验时同学们�现蚯蚓的体表是有黏液的这有利于蚯蚓 a.吸收营养 b.保持水分c.进行�吸 coloring