更多“集中式供水单位必须有”相关的问题
Passage Two A controversy erupted in the scientific community in early 1998 over the use of DNA (deoxyribonucleic acid) fingerprinting in criminal investigations. DNA fingerprinting was introduced in 1987 as a method to identify individuals based on a pattern seen in their DNA, the molecule of which genes are made. DNA is present in every cell of the body except red blood cells. DNA fingerprinting has been used successfully in various ways, such as to determine paternity (父亲的身份) where it is not clear who the father of a particular child is. However, it is in the area of criminal investigations that DNA fingerprinting has potentially powerful and controversial uses. DNA fingerprinting and other DNA analysis techniques have revolutionized criminal investigations by giving investigators powerful new tools in the attempt to prove guilt, not just establish innocence. When used in criminal investigations, a DNA fingerprint pattern from a suspect is compared with a DNA fingerprint pattern obtained from such material as hairs or blood found at the scene of a crime. A match between the two DNA samples can be used as evidence to convict a suspect. The controversy in 1998 stemmed from a report published in December 1991 by population geneticists Richard C. Lewontin of Harvard University in Cambridge, Mass, and Daniel L. Hartl of Washington University School of Medicine in St. Louis, Mo. Lewontin and Hartl called into question the methods to calculate how likely it is that a match between two DNA fingerprints might occur by chance alone. In particular, they argued that the current method Cannot properly determine the likelihood that two DNA samples will match because they came from the same individual rather than simply from two different individuals who are members of the same ethnic group. Lewontin and Hartl called for better surveys of DNA patterns. In response to their criticisms, population geneticists Ranajit Chakraborty of the University of Texas in Dallas and Kenneth K. Kidd of Yale University in New Haven, Conn. , argued that enough data are already available to show that the methods currently being used are adequate. In January 1998, however, the Federal Bureau of investigation and laboratories that conduct DNA tests announced that they would collect additional DNA samples from various ethnic groups in an attempt to resolve some of these questions. And, in April, the National Academy of Sciences called for strict standards and system of accreditation (鉴定合格) for DNA testing laboratories.
A．enough data are yet to be collected from various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual membersB．enough data of DNA samples should be collected to confirm that only DNA samples from the same person can matchC．enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming from the same personD．additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person 61. The National Academy of Sciences holds the stance that ______ .
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《中华人民共和国物权法》第39条规定：“所有权人对自己的不动产或者动产，依法享有占有、使用、收益和处分的权利。” 请根据民法原理分析：所有权的特征。
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由于KTB提高了RH表观脱碳速度常数，在保证相同的脱碳时间的条件下，可使初始碳含量从0.025%提高到（）%。
A . 0.03
B . 0.04
C . 0.06
D . 0.05
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当人才招聘竞争特别激烈的时候会出现()的情况。
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水结冰时体积膨胀，所以冰的密度比水的密度小，能浮在水面上。
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燃油系统的功用是储存燃油，并提供一定压力的清洁燃油，在电脑的控制下将一定量的燃油喷入进气歧管。
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右侧第12肋斜过（）
A.右肾的上方
B.右肾后面的上部
C.右肾后面的中部
D.右肾后面的下部
E.以上都不对
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禽流感一般发生在春夏季，一般不会在人与人之间传染。
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冷凝器与膨胀阀之间的冷媒属于（）
\tA.高压气体
\tB.高压液体
\tC.低压气体
\tD.低压液体
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（2002年）下列劳动合同或劳务合同，哪些属于劳动法的调整范围？
A．某私营企业与职工之间的劳动合同
B．某国家机关与工勤人员之间的劳动合同
C．某公司董事长与公司之间的聘用合同
D．甲公司与乙公司之间的劳务合同
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线性方程组Ax=b(b为非零向量)一定有解
A. 对B. 错
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www.163.com是指（）
A . 域名
B . 程序语句
C . 电子邮件地址
D . 超文本传输协议
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如果作左手腕部X线摄片，可显示的骨化中心数最多为（）
A.0个
B.1个
C.2个
D.3个
E.4个
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在我国，公民的选举权取决于国籍、年龄和教育程度。
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