问题：
[单选题]单层厂房结构吊装中，在柱脚与基础杯口的空隙浇筑细石混凝土作最后固定时，第一次浇筑的混凝土强度达到设计强度等级的（ ）后可以进行第二次浇筑。
A、25%
B、50%
C、75%
D、100%
参考答案：
A
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