在施工缝处继续浇筑混凝土时,先前已浇筑混凝土的抗压强度应不小于( )。
A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/13558636_0.jpg"> B
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/13558636_0_1.jpg"> C
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/13558636_0_2.jpg"> D
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/13558636_0_3.jpg">