On the evening of October 7, Li Feng was watching TV while his mother was ____ b      cooking supper in the kitchen. ____ S       the telephone rang. Li Feng ____ q     picked it up to____ a        the call. It was from a good friend of his____ m     . She wanted to say “Happy Birthday” to his mother. "Today is Mother's birthday, but I have already____       f_____all about it. Mother gives me a lot of____ l      and care while I didn't care for her____ e    . From now on, I must always____ r     this, ____ s     my love to her and care for her enough,” Li Feng thought to himself, feeling a little ashamed(惭愧的).

如图所示，在一圆形管道内封闭有理想气体，用一固定活塞K和不计质量可自由移动的活塞A将管内气体分割成体积相等的两部分，温度都为T₀=300K，压强都为P₀=1.0×l0⁵Pa．现保持下部分气体温度不变，只对上部分气体缓慢加热，当活塞A移动到最低点B时（不计摩擦），求：

中国六,七十年代乒坛上有过一颗新星,叫韩玉珍.她刻苦训练,曾获得过"练不倒的韩玉珍,打不垮的铜墙铁壁"的盛誉.她曾两度逼近世界冠军的颠峰,又两次垮了下来.第一次,因比赛前过于紧张临阵脱逃,用小刀刺破自己的手,却谎称有袭击破坏.第二次则在她已经领先两局的情况下,仅仅因为对手追上几分,心慌手软,败下阵来,她越怕越输,越输越怕,终于又抑制不住,谎称阑尾炎,腹部剧痛,想躲过比赛。这两件事成了国际乒坛丑闻.这说明她有（   ）