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                "e_12",
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        "elements": [
            {
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                "type": "text",
                "props": {
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                    "text": "数学试卷测试"
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                    "text": "如图，在△ABC中，∠C=90°。AC=4，BC=3。让△ABC绕A点逆时针旋转，使点C落在AB的E点上，点B落在D点上，求EB的长度？"
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                    "ctrl2X": 513,
                    "ctrl2Y": 208,
                    "ctrl3X": 713,
                    "ctrl3Y": 208,
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                "type": "text",
                "props": {
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                    "alpha": 1,
                    "letterspacing": 0,
                    "background": "",
                    "forecolor": "#000000",
                    "hpos": "center",
                    "vpos": "center",
                    "text": "B"
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            },
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                "id": "e_12",
                "type": "text",
                "props": {
                    "x": 678,
                    "y": 306,
                    "width": 25,
                    "height": 25,
                    "rotate": 0,
                    "fontsize": 14,
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                    "alpha": 1,
                    "letterspacing": 0,
                    "background": "",
                    "forecolor": "#000000",
                    "hpos": "center",
                    "vpos": "center",
                    "text": "C"
                }
            },
            {
                "id": "e_13",
                "type": "text",
                "props": {
                    "x": 700,
                    "y": 67,
                    "width": 25,
                    "height": 25,
                    "rotate": 0,
                    "fontsize": 14,
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                    "alpha": 1,
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                    "background": "",
                    "forecolor": "#000000",
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                    "vpos": "center",
                    "text": "D"
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                "type": "text",
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                    "y": 182,
                    "width": 25,
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                    "rotate": 0,
                    "fontsize": 14,
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                    "alpha": 1,
                    "letterspacing": 0,
                    "background": "",
                    "forecolor": "#000000",
                    "hpos": "center",
                    "vpos": "center",
                    "text": "E"
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            },
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                "id": "e_15",
                "type": "svg/triangle",
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                    "y": 208,
                    "width": 229,
                    "height": 96,
                    "ctrl1X": 690,
                    "ctrl1Y": 304,
                    "ctrl2X": 742,
                    "ctrl2Y": 208,
                    "ctrl3X": 513,
                    "ctrl3Y": 208,
                    "linewidth": 1,
                    "dash": 0,
                    "alpha": 1,
                    "color": "#000000",
                    "fillcolor": ""
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            },
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                "type": "text",
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                    "y": 397,
                    "width": 200,
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                    "fontsize": 16,
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                    "letterspacing": 0,
                    "background": "",
                    "forecolor": "#000000",
                    "styleBold": true,
                    "hpos": "flex-start",
                    "vpos": "center",
                    "text": "求方程组"
                }
            },
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                "type": "formula",
                "props": {
                    "x": 76,
                    "y": 472,
                    "width": 200,
                    "height": 28,
                    "rotate": 0,
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                    "color": "#000000",
                    "alpha": 1,
                    "text": "x^2-2xy-3y^2=5"
                }
            },
            {
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                "type": "formula",
                "props": {
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                    "y": 524,
                    "width": 200,
                    "height": 28,
                    "rotate": 0,
                    "fontsize": 14,
                    "color": "#000000",
                    "alpha": 1,
                    "text": "x+y=1"
                }
            },
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                "type": "svg/brace",
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                    "y": 485,
                    "width": 10,
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                    "rotate": 0,
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                    "alpha": 1,
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    "success": true
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