一长为L、质量m且分布均匀的细绳平放在水平地面上,把这根细绳从一端缓慢提起.当这根绳的末端刚离地面时,绳子的重力势能增加 ____.
“天下兴亡,匹夫有责。”我们逐渐长大,越来越具有独立的思想和行为能力,责任就逐渐进入我们的生活。随着我们成长、成熟,我们应承担的责任也将越来越重。
根据句意及首字母提示完成单词。(1)S____ is my aunt, Ms Jones.(2)Your pencil is h ____. His pencil is over there.(3)Is that her family p____ ? It's very nice.(4)Mr Green is not my u____ . He is my father.(5)This is Mrs Brown's d____ , Gina.
按规律写数。
11 ____33 ____55 66