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【单选题】
化工制图中以下哪种铅笔用于加粗图线

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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( )。

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【判断题】
在工序质量控制图中,只要点落在控制线之外就表示出现废品。

正确
错误
【多选题】
在国标GB/T17450-1998《技术制图图线》中规定的图线的基本线型有()。

虚线
虚实线
尺寸界线
双点画线
破折线
【多选题】
在国标GB/T17450-1998《技术制图图线》中规定的图线的基本线型有()。

粗实线
细实线
粗点画线
细点画线
对称线
【判断题】
国家制图标准规定,各种图线的粗细相同。

正确
错误
【判断题】
化工工艺图也是化工制图的研究的主要内容

正确
错误
【判断题】
化工设备图是化工制图研究的主要内容

正确
错误
【单选题】
制图中,把光源称为( )。

投影面
投影中心
投影线
投影法
【单选题】
制图中,把光线称为( )。

投影中心
投影线
投影面
投影法