某泵送外加剂抗压强度比试验结果如下表所示：<br /> <img src="https://nimg.ppkao.com/2018-10/luoyueping/201810111536139403.jpg?sign=6d6ebb909f090b92ddf88bbf464014b7&t=62d346a8" /><br /> 则该外加剂28d抗压强度比为（）&ensp;