在饲养和观察蚯蚓的实验中依靠蚯蚓身体的 来判断蚯蚓身体的前后端在观察过程中应经常用浸水的湿润棉球轻擦蚯蚓体表使体表保持湿润其原因是 Template




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tomski在饲养和观察蚯蚓的实验中依靠蚯蚓身体的 来判断蚯蚓身体的前后端在观察过程中应经常用浸水的湿润棉球轻擦蚯蚓体表使体表保持湿润其原因是 coloring