In China, people born in and after the 1980s are called the post-80s generation(一代人). Most of them come from single-child families. However, this generation is playing a more and more important part in China, and their image(形象) in people's minds is changing. Han Han, a popular youth writer, is one of them.

    Han Han was born in 1982 in Shanghai. His talent for writing was clear at an early age. When he was 17, he attracted the public's attention with the article Viewing the People throughthe Glass. The article won first prize in the national New Concept Composition Competition. Later, Han Han again surprised the public by leaving high school. "I didn't do well in Grade One of high school and failed to move up to the next grade. I tried my best to improve my studies, but failed, so I gave up. However, I am always learning, since learning and going to school are two different things," Han Han said.

    Han Han's first novel Three Folded Gates sold very well in China. Later the book was translated(翻译) into several languages and sold abroad.

    In the following years, Han Han wrote a lot of books. All of them were welcomed by the market. In 2006, he started blogging (写博客) and had great success. Today, Han Han's blog has become one of the honest blogs on the Internet.

下列现象中，能正确反映或证明地球公转的是(     )

某一直流电动机提升重物的装置，如图所示，重物的质量m=50kg，电源提供给电动机的电压为U=110V，不计各种摩擦，当电动机以v=0.9m/s的恒定速度向上提升重物时，电路中的电流I=5.0A，则电动机的线圈电阻R=____ Ω，电动机提升重物的效率η=____ 。（取g=10N/kg）

现在大部分马体格高大，奔跑如飞。科学家们已经找到了与现代马相似的动物的前肢骨骼化石，同时也已确定化石中的动物生存的大致时期（如右图所示，各图与其实物比例相同），他们认为这些动物是现代马的祖先。