题目内容
安徽天星野生动物园医院设有一排装动物的笼子，每只笼子只装一只动物。为了避免打搅动物，医院不安排某种捕食者和被捕食者相邻居住。能够接受的动物的物种是O、R、S、T、U。它们之间仅有的捕食关系如下： (1)O捕食R。 (2)U捕食R。 (3)O捕食S。 (4)S捕食T。 下列哪一个是5种动物在连续的笼子里可以接受的安排
查看答案
搜索结果不匹配？点我反馈
更多问题
在一个实验中，选200只所属种类通常不患血癌的老鼠，对它们施以同等量的辐射，并且让其中一半老鼠敞开肚皮去吃它们爱吃的食物，让另一半老鼠也吃同样的食物，但是限制它们的进食量。第一组中，55只老鼠惠了血癌；第二组中，患血癌的老鼠仅有3只。 上述实验最支持下面哪一个结论：
数据加密标准(DES)是一种分组密码，将明文分成大小 (43) 位的块进行加密，密钥长度为 (44) 位。
Dear Ms. Emily, The need for a biology teacher in the Heavilon Community Schools was indicated in the Purdue University Educational Listings of June 7, 2008. If this vacancy still exists, please consider me as an applicant for the position and send me a teacher application． On May 13, 2008，I graduated from Purdue University with a B. S. degree. I received an Indiana Secondary Standard Certificate with a major in biology and a minor in botany. In addition to this formal education, the past two summers were spent at the Gull Lake Biological Station where I worked as a laboratory assistant. The preceding two summers were spent in field work with the Indiana Department of Conservation. These experiences have been valuable additions to my educational background. During the fall semester, 2007, I did my student teaching in biology at Central High School in Lafayette, Indiana. My resume is enclosed for your information, and my credentials are available at the Educational P1acement Office, Purdue University, West Lafayette, Indiana. A personal interview Can also be arranged at your request. Sincerely, Lydia Wong Enclosure: Resume What position is she applying for She is applying for the position of ______in the Heavilon Community Schools．
贾女士：一项权威性的调查数据显示，在医疗技术和设施最先进的美国，婴儿最低死亡率在世界上只占第17位。这使我得出结论，先进的医疗技术和设施，对于人类生命和健康所起的保护作用，对成人要比对婴儿显著得多。 陈先生：我不能同意您的论证。事实上，一个国家所具有的先进的医疗技术和设施，并不是每个人都能均等地享受的。较之医疗技术和设施而言，较高的婴儿死亡率更可能是低收入的结果。 陈先生的反驳基于以下哪项假设 Ⅰ．在美国，享受先进的医疗技术和设施，需要一定的经济条件。 Ⅱ．在美国，存在着明显的贫富差别。 Ⅲ．在美国，先进的医疗技术和设施，主要用于成人的保健和治疗。
微信支付 
支付宝支付