JIT杜绝“过量生产”、“过量储备”、“无效劳动”。( )
参考答案：对
I can't leave. She told me that I ____ stay here until she comes back. [ ]
A. may
B. must
C. can
D. will
建立人工通气的最好方法是（）
A.面罩吸氧
B.口对口呼吸
C.挤压胸部
D.气管内插管
E.鼻导管吸氧
