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Changes of dipalmitoyl phosphatidyl choline after mechanical ventilation in patients with acute cere
Objective: To detect the levels of dipalmitoyl phosphatidyl choline (DPPC) in the sputum of the patients with acute cere......
电力变压器室通风散热和降噪问题一直是变电站设计所关注的重要问题.为更好地实现变压器室散热与降噪功能,选取具有代表性的典型10......

