考虑实际系统中信号传输通道的数量限制，本文中确定了以下步骤进行被测线路和被控发电机的选择。

Considering the number limit of signal transmit channels, the selection of line which is measured and generator which is controlled goes along following these steps in this paper.

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训练后，被试接受5种后测任务：盒子任务、转移任务、外表-事实任务、来源任务和数量守恒任务。

After training, all subjects received five posttest tasks: box task, transfer task, appearance-reality task, sources task and number conservation task.

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训练后，被试接受5种后测任务：盒子任务、转移任务、外表-事实任务、来源任务和数量守恒任务。

After training, all subjects received five posttest tasks: box task, transfer task, appearance-reality task, sources task and number conservation task.

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