齿轮传动有哪些优点？

如图所示，单摆甲放在空气中，周期为T_甲，单摆乙带正电，放在匀强磁场中，周期为T_乙，单摆丙带正电，放在匀强电场中，周期T_丙，单摆丁放在静止在水平面上的光滑斜面上，周期为T_丁，那么(    )

A．T_甲>T_乙>T_丙=>T_丁

B．T_乙>T_甲=T_丙>T_丁

C．T_丙>T_甲>T_丁=>T_乙

D．T_丁>T_甲=T_乙>T_丙

分子、分母是质数的分数是最简分数______．（判断对错）

* * 党的十六届六全会于2006年10月8号在北京召开，构建“和谐社会”和“和谐世界”成为会议的主题，请回答:

(1)孔子为调整人际关系，稳定社会秩序提出了什么样的主张？（4分）

（2）战后，发达国家实行的福利制度是保障社会稳定、实现社会和谐的重要措施，你如何评价这一制度？（3分）

（3）民主法制建设是实现社会和谐的重要内容，十一届三中全会以后，党在民主法制建设方面有哪些重要举措？（4分）

（4）“睦邻”外交是中国实现“和谐世界”的重要举措，改革开放后，为促进中亚地区的和平与稳定，中国采取的最重要举措是什么？（2分）

按照《中国银监会办公厅关于印发银行业金融机构案防工作办法的通知》规定，以下说法，哪些是正确的（）

A.董事长为案件风险防范第一责任人

B.行长为案防制度执行第一责任人

C.监事长为案防制度制定第一责任人

D.董事长为案件风险监督第一责任人

Scientists have for the first time used cloning to create human embryos that live long enough in a laboratory dish to have their stem cells harvested. The feat could set the stage for physicians to produce cells and tissues, tailored to a patient’s genetic identity that can treat a wide variety of human illnesses. The accomplishment also provides a road map for how to clone a person, an even more divisive undertaking.

The new work, performed in South Korea, represents "a major advance in stem cell research. It could help spur a medical revolution as important as antibiotics and vaccines", says Robert Lanza of Advanced Cell Technology (ACT), a company in Worcester, Mass., that’s also investigating the promising stem cell strategy called therapeutic cloning.

"However, now that the methodology is publicly available", Lanza adds, "I think it is absolutely imperative that we pass laws worldwide to prevent the technology from being abused for reproductive-cloning purposes."

While some fertility doctors and a religious cult have claimed success at creating a pregnancy via cloning, they’ve offered no convincing proof. In contrast, the South Korean research is being reported at the meeting of the American Association for the Advancement of Science in Seattle and will appear in an upcoming Science. "This is reality," says stem cell researcher John Gearhart of Johns Hopkins University. "He4’e is a bona fide, refereed journal saying that a human embryo has been cloned and a cell line derived from it."

Although ACT has not yet published a report of a cloned human blastocyst, Lanza says that the South Korean success is "consistent with our own results." Therapeutic cloning appeals to Lanza and physicians because cells made this way could have the same DNA as a patient’s cells do and thus avoid rejection after they’re transplanted.

Seeking a compromise that would permit this strategy to be pursued, many scientists have called for legislation that would ban cloning to produce a baby but allow the creation of cloned embryos to generate stem cells for research or therapies. "The debate has been very polarized," notes bio-ethicist Laurie Zoloth of Northwestern University in Evanston.

It can be inferred from the passage that human cloning（）

A. has not been so successful as some fertility doctors claim

B. will definitely be banned through legislations

C. has encountered huge technological and funding problems

D. is another project being implemented by South Korean scientists