A.50mm B.100mm C.150mm D.200mm
A.8h B.16h C.24h D.30h
A.水泥(700號)∶砂∶石∶水=0511505∶∶∶ B.水泥(700號)∶砂∶石∶水=111037∶∶∶ C.水泥(700號)∶砂∶石∶水=234∶∶∶5 D.水泥(700號)∶砂∶石∶水=12131405