吸氧面罩与麻醉机螺纹管间改良设计连接管在无痛胃镜检查中的应用观察
흡양면조여마취궤라문관간개량설계련접관재무통위경검사중적응용관찰
Application of improved connecting tube in oxygen mask and threaded pipe of anesthesia machine in painless gastroscopy
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