1在做观察蚯蚓的运动的实验时将蚯蚓放在粗糙的纸上和平�的玻璃板上�现蚯蚓在 上运动的速度要快在观察过程中应经常用浸水的湿棉球轻擦 Template




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tomski1在做观察蚯蚓的运动的实验时将蚯蚓放在粗糙的纸上和平�的玻璃板上�现蚯蚓在 上运动的速度要快在观察过程中应经常用浸水的湿棉球轻擦 coloring