Conclusions The treating of calculus of intrahepatic duct with multiple access minimal invasive technique is worth to spread because of lower trauma and remnant stones.
结论多路微创技术治疗肝内胆管结石具有手术创伤小，取石率高，残余结石率低的优点，值得推广。
2
Air flow measurement of utility boilers is often liken by using venturi duct, latticed wing, multiple pilot tube and double venturi tube.
电站锅炉的通风量，主要用风道型文丘里、机翼、笛型管及双文丘里进行测量。
3
Objective:To study the treatment of residual stone(RS) after the operation of multiple calculi of intrahepatic duct.