The operation process of editing D and adding a horizontal line in MathType

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1. Open the MathType formula editor and enter the formula editing interface.

2. After entering the editing interface, click the [Edit]-[Insert Symbol] command in the MathType menu, and then a dialog box will pop up.

3. In the pop-up [Insert Symbol] dialog box, select [Style] in the drop-down menu of [View], and then select [Text] in the drop-down menu of [Style] 】. At this time, the symbols in the symbol panel below will change phase, displaying the symbols in the corresponding mode. Pull the scroll bar in the symbol panel, find the symbol, click the symbol, and then click [Insert] and [OK].

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