判断题
A.1:1.60:3.11;W/C=0.50B.1:1.64:3.18;W/C=0.50C.1:1.68:3.26;W/C=0.50D.1:1.74:3.38;W/C=0.50
A.42.61MPaB.44.45MPaC.46.27MpaD.48.50MPa