(来学网)混凝士混合料应按质量比计算配合比,其外加剂的允许误差为()
  • A.
    (来学网)±0.5%
  • B.
    (来学网)±2%
  • C.
    (来学网)±1%
  • D.
    (来学网)±1.5%