【判断题】【消耗次数：1】
电气原理图中主电路用粗实线，控制电路和辅助的信号指示及保护电路用细实线。
①
正确
②
错误
参考答案：
复制
纠错
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【单选题】
化工制图中图线宽度分粗、中粗、细三种，若粗实线的宽度为d，则细实线的宽度为( )。
①
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2d
②
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1/2d
④
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1/4d
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