国际推介与询价的工作主要包括以下几个环节：预路演、路演推介、簿记定价。( )

2000年6月，美、英、日、法、德、中六国公布：人类基因组序列图的"工作框架图"绘出。2001年2月12日，六国又联合公布了经过整理、分类和排序后更加准确、清晰、完整的人类基因组图谱。这一成就将为解释人类疾病的本原、新药的设计、新治疗方法的产生提供重要依据，它奠定了21世纪医学生物学和其他相关科学飞速发展的基础。同时人们也担心，这项成果如果用于危害人类研究，其后果也是不可设想的。上述情况表达的最主要思想是（）

A.科学技术进步的力量是无穷的

B.道德在科学技术进步面前是无能为力的

C.现代医学科学发展需要医学道德把关

D.医学道德制约了医学科学的发展

E.基因科学的发展是解决人类全部健康问题的根本

The prospects for finding life beyond Earth may be brightening. Today, scientists are reporting evidence for yet another potential habitat in our solar system: Saturn’s moon Enceladus. Scientists mining new data from the Cassini spacecraft say they may have found evidence that Enceladus—the planet’s fourth-largest moon—hosts liquid water.
If the results hold up, this would bring to four the number of bodies in the solar system—including Earth—that display active volcanism. And since life as biologists know it requires liquid water and a source of energy, Enceladus would join Jupiter’s moon Europa and Saturn’s moon Titan, as well as Mars, as possible spots beyond Earth where simple forms of life may have gained or still maintain a foothold.
The discovery, however, is bittersweet for many scientists. NASA’s proposed budget for fiscal 2007 calls for a 50 percent cut in its astrobiology program. Although the program is a tiny piece of the agency’s overall spending plan for science, it’s a significant source of money for probing fundamental questions of how and why life emerged on Earth and whether life arose elsewhere in the universe.
A 50-percent cut "is almost a going-out-of-business-level cut" in a vibrant line of research that stands as one pillar supporting President Bush’s vision for space exploration, says planetary scientist Sean Solomon, who heads the Department of Terrestrial Magnetism at the Carnegie Institution of Washington.
Nevertheless, the research in today’s issue of the journal Science is the sort of thing that continues to light a fire under the field. Its report about liquid water under the icy surface of Enceladus is a "radical conclusion," acknowledges Carolyn Porco, who leads the imaging team working with data from the Cassini orbiter. But if the team is right, "we have significantly broadened the diversity of solar-system environments" that might have rolled out the welcome mat "for living organisms," she concludes. Images released last fall show the moon ejecting vast plumes of material near its unexpectedly warm south pole. As the team pondered the evidence, they nixed several explanations, including the idea that the particles in the plumes were driven by vapor billowing out as ice reached the surface and immediately turned into a gas. The last idea standing: Liquid water was venting from reservoirs near the surface, perhaps only tens of meters below the frigid crust. This explanation also helped solve the riddle of puzzlingly high levels of oxygen atoms found in Saturn’s neighborhood.
Confirmation could come with additional flybys. If water—and perhaps life—is present, it wouldn’t be "luxuriant," notes Jeffrey Kargel, a researcher at the University of Arizona at Tucson. It likely would face tough conditions—nasty chemicals, very low temperatures, and little energy to drive it. still, he adds, it’s premature to cross the moon off the list of possible "outposts" for life beyond Earth. Yet the prospect of building on these results could be dimmer with the threat of budget cuts. The proposed reductions post several challenges, researchers say.
One is the loss of important financial leverage. While money for experiments and other research related to astrobiology can come from other funding agencies, such as the National Science Foundation or even the National Institutes of Health, NASA’s program often provides the crucial missing piece that turns demanding and sometimes dangerous fieldwork into exciting results.
One of the biggest successes over the program’s 10-year history has been to help revolutionize the way science is done. Answering questions about the origins of life on Earth and the prospects for life elsewhere require p collaborations. From radio astronomers to biologists and geologists studying the evolution of Earth, groups are working together in ways they never thought of a decade ago, adds Edward Young, a geochemist at the University of California at Los Angeles.
"NASA’s made a lot of progress by making a relatively small investment in a way that has brought disparate experts together from the whole spectrum of physical and biological sciences. It’s a wonderful lesson on how to make progress by crossing these boundaries," Dr. Solomon says. "It would be regrettable to stop that experiment. \

When the author says "The discovery, however, is bittersweet for many scientists. " (para. 3), he most probably means that the discovery ______.

A．greatly discourages scientists

B．leads to the cutting of NASA’s budget

C．causes much doubt and argument

D．brings scientists both good and bad news

用如图实验装置验证m₁、m₂组成的系统机械能守恒。m₂从高处由静止开始下落，m₁上拖着的纸带打出一系列的点，对纸带上的点迹进行测量，即可验证机械能守恒定律。下图给出的是实验中获取的一条纸带：0是打下的第一个点，每相邻两计数点间还有4个点（图中未标出），计数点间的距离如图所示。已知m₁=50g、m₂=150g ，则（g取10m/s²，结果保留两位有效数字） 

（1）在纸带上打下记数点5时的速度v=________m/s；

（2）在打点0~5过程中系统动能的增量△E_K=________J，系统势能的减少量△E_P=________J，由此得出的结论是________________________；

（3）实验小组某同学先得出了v-h图像，继而又得出v²-h图像，如图甲、乙所示：该同学在得出v-h图像后，为什么还要作出v²-h图像？________________________。

（4）另一同学作出图像如图丙，则当地的实际重力加速度g=________m/s²。

第一台金属活字手摇印刷机的发明者是（）。

A.毕昇

B.谷登堡

C.摩尔斯

D.爱迪生

卡箍式接头的形式有（）。

A.刚性接头

B.焊接接头

C.自缚式接头

D.挠性接头