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【单选题】
关于砂石基础施工，哪项叙述不正确。（）A.
铺设前对槽底进行检查，槽底高程及槽宽须符合设计要求，且不应有积水和软泥
B.
柔性管道的基础结构设计无要求时，宜铺设厚度不小于100mm的中粗砂垫层；软土地基宜铺垫一层厚度不小于150mm的砂砾或5~40mm碎石，其表面再铺厚度不小于50mm的中、粗砂垫层
C.
柔性接口的刚性管道的基础结构，设计无要求时一般土质地段可铺设砂垫层，亦可铺设25mm以下碎石，表面再铺20mm厚的砂垫层（中、粗砂），垫层总厚度应符合规范的规定
D.
管道有效支承角范围必须用细砂填充插捣密实，与紧密接触，不得用其他材料填充
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举一反三
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She concerned herself with current social problems.
B.
She motivated students to learn music with her creativity.
C.
She has taught music at the elementary school for 22 years.
D.
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D.
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