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依据《湖南省住宅工程质量通病防治技术规程》DBJ43/T306-2014第4.2.3条，下列关于钢筋混凝土现浇板施工说法不正确的是（）。A.
板底层钢筋保护层垫块不得采用花岗岩或大理石块，板上层钢筋的支凳间距不应大于1000mm×1000mm。
B.
钢筋的级别、直径、位置、数量、长度、接头位置及保护层厚度等应符合设计和国家现行标准《混凝土结构工程施工质量验收规范》GB50204的要求。
C.
板内预埋水平线管的直径不应大于板厚的1/3，并置于板顶层钢筋之上。
D.
板内线管预埋宜避免交叉，确需交叉时接线盒。如接线盒或管线交叉不便设置接线盒位置的上方无楼板配筋，应增设直径为6mm、间距为150mm、宽度不小于500mm的双向钢筋网片。
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