C60机制砂混凝土
C60 concrete with machine-made sand
远距离泵送机制砂混凝土
Long distance pump-delivering concrete mixed with machine- processed sand
碗形树脂砂混砂机
spheroidal bowl resin sand mixer
预制混凝土连接机构详图
precast concrete connection details
60m预制混凝土箱梁
60 m precast concrete box girder