题目

For years we have been told that encouraging a child's self-respect in important to his or her success in life .But child expert are now learning that too much praise can lead to the opposite effect, Praise-aholic kids who expect it at every turn may become teens who seek the same kind of approval form their friends when asked if they want to go in the backseat of the           car . The implication (含义)of saying “You are the prettiest girl in class ,” or talking about the goals she scored but not her overall effort ,is that you love her only when she looks the best ,sc 带有活塞的汽缸内封闭一定量的理想气体。气体开始处于状态a,然后经过过程ab到达状态b或经过过程ac到状态c,b、c状态温度相同,如V-T图所示。设气体在状态b和状态c的压强分别为Pb、和PC,在过程ab和ac中吸收的热量分别为Qab和Qac,则(   ) A.Pb >Pc,Qab>Qac     B.Pb >Pc,Qab<Qac C.Pb <Pc,Qab>Qac     D.Pb <Pc,Qab<Qac
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