【单选题】
蒸压灰砂砖（简称灰砂砖）是以（ ）。
①
黏土、页岩、煤矸石为主要原料，经焙烧而成的主要用于非承重部位的空心砖
②
石灰和砂为主要原料，经坯料制备、压制成型，再经高压饱和蒸汽养护而成的砖
③
黏土、页岩、煤矸石为主要原料，经坯料制备、压制成型的砖
④
石灰和砂为主要原料，经焙烧而成的砖
【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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d
③
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④
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