短语词组短语casing -head 套管头casing screw head 套管母扣护丝casing drive head 套管帽casing g head 套管头casing circulating head 套管循环接头Humate additive for casing -head mud 腐殖酸钻井泥浆添加剂cement casing head 水泥头;注水泥套管头 返回 casing head