layout1.gv

digraph G {
    rankdir = "LR";
    fontsize=10;
    fontname="serif";
    node [fontsize=10 fontname="serif" shape=box style=rounded width=0.4 height=0.2];
    edge [arrowsize=0.5];
    concentrate=true;
    nodesep = 0.18;
    ranksep = 0.2;
    newrank = true;
    // splines = ortho

    n24 [label="电子产品\n装配实践"];
    n25 [label="电子信息\n技术导论"];
    n08 [label="工程制图"];

    n01 [label="高等数学\n（一）上"];
    n02 [label="高等数学\n（一）下"];
    n03 [label="线性代数"];
    n04 [label="概率统计"];
    n05 [label="工程数学(复变)"];
    n06 [label="普通物理\n（二）（上）"];
    n07 [label="普通物理\n（二）（下）"];
    
    n09 [label="计算机\n信息技术"];
    n10 [label="C程序设计"];
    n11 [label="电路分析"];
    n12 [label="模拟电路"];
    n13 [label="数字系统与\n逻辑设计"];
    n14 [label="信号与系统"];
    n15 [label="电磁场与电磁波"];

    n16 [label="计算机通\n信与网络"];
    n17 [label="数字信号处理"];
    n18 [label="通信电子线路"];
    n19 [label="通信原理"];

    n20 [label="微波技术与天线"];
    n21 [label="微机原理与\n接口技术"];

    n23 [label="普通物理实验"];
    n26 [label="电子技术\n基础实验"];
    n27 [label="信号与电路\n基础实验"];
    n28 [label="微机原理与\n接口技术实验"];
    n29 [label="电子线路实验"];
    n30 [label="程序设计与\n软件工程实践"];
    n31 [label="金工实习"];
    n32 [label="通信系统\n设计与实践"];
    n33 [label="毕业实习"];
    n34 [label="毕业设计\n（论文）"];

    subgraph cluster_0 {
        style=filled;
        color=lightgrey;
        node [style=filled,color=white,shape=box];
        "term1" [label="第一学期"];
        "term2" [label="第二学期"];
        "term3" [label="第三学期"];
        "term4" [label="第四学期"];
        "term5" [label="第五学期"];
        "term6" [label="第六学期"];
        "term7" [label="第七学期"];
        "term8" [label="第八学期"];
        term1 -> term2 -> term3 -> term4 -> term5 -> term6 -> term7 -> term8 [style=invis];
    }

    {rank = same; term1; n03; n01; n09; n08; n24; }
    {rank = same; term2; n04; n02; n06; n23; n10; n25; n11; }
    {rank = same; term3; n07; n26; n05; n13; }
    {rank = same; term4; n14; n27; n18; n21; n28; }
    {rank = same; term5; n15; n17; n29; n16; }
    {rank = same; term6; n31; n20; n19; n30 }
    {rank = same; term7; n32; n33 }
    {rank = same; term8; n34;}

    n01 -> n02 -> n05; n01 -> n04 -> n19; n01 -> n06 -> n07 -> n15 -> n20;
    n09 -> n10 -> n16 -> {n30, n32 }; n11 -> n12 -> n18 -> n29;
    n11 -> n13 -> n21 -> {n32, n28 };
    {n01, n03} -> n11 -> n14 -> n17 -> n19 -> n32
    n05 -> n14; n05 -> n15
    n10 -> n21; n08 -> n31;
    n06 -> n23; n11 -> n26; n27 -> n14 [dir=back];
}