更多“选择铁路货运代理应关注（）。”相关的问题
减速线的设置要求：（）反光虚线，根据设置位置的不同，可以是单虚线、双虚线、和重复（），垂直于行车方向设置。
A . 白色、三次
B . 黄色、三次
C . 白色、两次
D . 黄色、两次
点击查看答案
光合作用是能量代谢的重要过程，以下说法错误的是（ ）
点击查看答案
可口可乐公司采用标准化的促销策略，关于该策略的说法正确的有( )
A．有利于节约成本
B．有利于在全世界树立统一和完整的公司形象
C．促销主题标准化
D．设计思想，主要方式标准化
E．不允许对促销方案作技术上的变动
点击查看答案
关于蛋白尿的原因，错误的描述是
A . A．肾小球通透性增加
B . B．肾小管吸收功能降低
C . C．食入蛋白质过多
D . D．肾缺血与乳酸增加
E . E．肾小管分泌的低分子量蛋白增多
点击查看答案
两个以上的申请人分别就相同内容的发明创造向国务院专利行政部门提出申请，应该将专利权授予(14)。
A．同时申请的两个人B．先申请人C．先使用人D．发明人
点击查看答案
石油沥青是根据针入度、延伸度、软化点三个技术指标确定其牌号的。
A. 正确B. 错误
点击查看答案
家庭暴力现象的周期性规律是（）年提出的。
A.1992
B.1993
C.1994
D.1995
点击查看答案
右侧结肠癌的临床表现特点是
A．腹部隐痛、贫血、腹部肿块
B．便秘腹泻交替、便血或黏液脓血便、腹部肿块、腹痛
C．全身中毒症状、肠梗阻症状
D．大便习惯改变、直肠刺激症状、大便变细
E．便血、贫血、腹泻
点击查看答案
千分尺是（）传动来实现测量的
A. 齿轮 B. 螺纹 C. 链条 D. 钢索
点击查看答案
主要表现为急进性肾炎综合征的是肾小球疾病是：（）。
A.急性弥漫性增生性肾小球肾炎
B.毛细血管内增生性肾小球肾炎
C.新月性肾小球肾炎
D.膜性肾小球肾炎
E.微小病变性肾小球肾炎
点击查看答案
Practice 2 Transgenic plants and animals result from genetic engineering experiments in which genetic material is moved from one organism to another, so that the latter will exhibit a characteristic. Business corporations, scientists, and farmers hope that transgenic techniques will allow more cost-effective and precise plants and animals with desirable characteristics that are not available using up to date breeding technology. Transgenic techniques allow genetic material to be transferred between completely unrelated organisms. In order for a transgenic technique to work, the genetic engineer must first construct a transgene, which is the gene to be introduced plus a control sequence. When making a transgene, scientists usually substitute the original promoter sequence with one that will be active in the correct tissues of the recipient plant or animal. The creation of transgenic animals is one of the most dramatic advances derived from recombinant DNA technology. A transgenic animal results from insertion of a foreign gene into an embryo. The foreign gene becomes a permanent part of the host animals’ genetic material. As the embryo develops, the foreign gene may be present in many cells of the body, including the germ cells of the testis or the ovary. If the transgenic animal is fertile, the inserted foreign gene (transgene) will be inherited by future progeny. Thus, a transgenic animal, once created, can persist into future generations. Transgenic animals are different from animals in which foreign cells or foreign organs have been engrafted. The progeny of engrafted animals do not inherit the experimental change. The progeny of transgenic animals do. The techniques for creating a transgenic animal include the following: 1) picking a foreign gene, 2) placing the foreign gene in a suitable form called a “construct” which guides the insertion of the foreign gene into the animal genome and encourages its expression, and 3) injecting the construct into a single fertilized egg or at the very early embryo stage of the host animal. Much genetic engineering goes into the choice of a foreign gene and building a construct. The construct must have promoters to turn on foreign gene expression at its new site within the host animal genome. By choosing a particular promoter and splicing it in front of the foreign gene, we can encourage expression of our transgene within a specific tissue. One of the most important applications of transgenic animals is the development of new animal models of human disease. Transgenic animals can serve as models for many malignant tumors. Mice have been the most frequent hosts for transgenic modification, other domestic animals have also been used. One idea has been to create transgenic cows which secrete important pharmaceutical substances in their milk. Other attempts are being made to express human interferon in the milk of sheep. A transgenic crop plant contains a gene or genes which have been artificially inserted instead of the plant acquiring them through pollination. The inserted gene sequence (known as the transgene) may come from another unrelated plant, or from a completely different species: transgenic BT corn, for example, which produces its own insecticide, containing a gene from a bacterium. Plants containing transgenes are often called genetically modified or GM crops although in reality all crops have been genetically modified from their original wild state by domestication, selection and controlled breeding over long periods of time.
点击查看答案
题目内容
（请给出正确答案）
参考答案
十点题库官方参考答案
（由十点题库聘请的专业题库老师提供的解答）
