【单选题】
出挑宽度指的是(??)??。
①
雨篷结构中心线至外墙结构外边线的宽度；?
②
结构中心线至外墙结构中心线的宽度；??
③
雨篷结构外边线至外墙结构外边线的宽度；?
④
雨篷结构外边线至外墙结构中心线的宽度。
【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