观察自然界中缠绕的茎和攀缘植物的卷须,它们的缠绕方向和生长方向有什么关系?这跟螺线管中电流的方向与其北极方向的关系是否相同?
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/06 12:54:44
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