To re-use across multiple graphs, or across multiple plot commands, use the set command.

要在多个图中或在多个plot命令中重新使用，需要使用set命令。

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The problem of traditional multiple integral is insufficient of student's space graphs thought.

传统的重积分教学问题是学生空间思维的不足。

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The problem of traditional multiple integral is insufficient of student's space graphs thought.

传统的重积分教学问题是学生空间思维的不足。

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