【单选题】【消耗次数：1】
工艺流程图中，绘制主要工艺物料管道采用的线型为 ，辅助管道采用的线型为 ，阀门采用的线型为 。1.粗实线 2.细实线 3.点画线 4.中实线
①
1,2,3
②
1,4,2
③
2,3,4
④
3,4,1
参考答案：
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