gravel pack sand  砾石充填砂

gravel-pack gravel  砾石充填用的砾石

sand control gravel  防砂砾石

frac-pack sand control  压裂防砂

sand control pack  防砂充填

Sand Control Screen  防砂筛管

bonded gravel screen  被耦合的砾石滤网

cement stabiliged sand - gravel base  水泥稳定砂砾基层

cement stabilized sand gravel  水泥稳定沙砾

cement stabilizing gravel-sand cushion course  水泥稳定砂砾垫层

cement-stabilized sand gravel base  水泥稳定砂砾基层

Cement-stable sand-gravel texture  水泥稳定砂砾结构

clay-core gravel sand dam  砂砾石粘土心墙坝

concentric string gravel pack  同心管柱砾石充填

Concrete Face Sand-gravel-fill Dam  砂砾石面板坝

Concrete-cored Sand-gravel Pile  混凝土芯砂石桩

concrete-cored sand-gravel piles  凝土芯砂石桩

consolidated gravel pack  胶结砾石充填

double crossover-squeeze gravel pack method  双桥分流式挤入砾石充填法