____very ____ ____ ____ with dogs.
Long long ago, showing… to, thinks hard, make clothes,
laugh at, lived in, shouted at
已知平行四边形ABCD的对角线交于点O,点P是直线BD上任意一点(异于B、O、D三点),过P点作平行于AC的直线交直线AD于点E,交直线BA于点F,当点P在线段BD上时,易证得:AC=PE+PF(如图①所示).当点P在线段BD的延长线上(如图②所示)和当点P在线段DB的延长线上(如图③所示)两种情况时,探究线段AC、PE、PF之间的数量关系,并对图③的结论进行证明.
Learning English online
Ways to learn English
English magazines, newspapers and radio
Various kinds of English learning1.
Benefits of online learning
People around the world can visit them 2.
People can get answers instantly on the Internet.
People can learn what they need anytime and search for useful3 without leaving home.
始于12世纪的罗马法复兴运动主要是私法研究的勃兴,在“复兴的罗马法”的结构中,它的法律制度不是基于形式法律的原则,就是基于物质的原则,这主要理解为经济方面和功利主义的考虑。 罗马法复兴是因为罗马法( )