题目

Move Earth—it’s no science fiction LONDON-Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is send a few comets（彗星）in the direction of Earth, and its orbit will be changed. Our world will then be sent spinning into a safer, colder part of the solar system. This idea for improving our climate comes from a group of US National Aeronautics and Space Administration（NASA） engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet—effectivel下列作图中，错误的是（ ）A. 动力F1的力臂B. 静止物体的受力分析C. 平面镜成像D. 磁体的磁场