先定概率
参考答案：呈现刺激前，主试要先告诉被试N和SN各自出现的概率。
_____ so many doctors and nurses around her, the sick girl didn't feel lonely at all.[ ]
A．For
B．In
C．With
D．By
试述串罐式结构无料钟炉顶有哪些重大的改进？
