Patients were randomly assigned to Group A and B . Group A were first ventilated in PCV for 12 hours ,and then in VCV for 12 hours .是什么意思_Patients were randomly assigned to Group A and B . Group A were first ventilated in PCV for 12 hours ,and then in VCV for 12 hours .在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句