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【判断题】
同一元素在不同化合物中,氧化数越高,其得电子能力越强。A.
正确
B.
错误
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举一反三
【单选题】When firms exit a monopolistically competitive industry:
A.
the average total cost curves of remaining firms will shift upward.
B.
the demand curves of remaining firms are increased at each level of output.
C.
the remaining firms will decrease production.
D.
the average revenue received by remaining firms will decrease at each level of output.
【单选题】When firms exit a monopolistically competitive industry:
A.
the average total cost curves of remaining firms will shift upward.
B.
the demand curves of remaining firms are decreased at each level of output.
C.
the remaining firms will decrease production.
D.
the average revenue received by remaining firms will increase at each level of output.
【单选题】Firms should use internal production of inpuits rather than using the market to purchase inputs when
A.
the market for inputs is perfectly competitive
B.
the degree of asset specificity for the input is low
C.
the transaction costs of using the market are low
D.
the transaction costs of using the market are high
【单选题】运用基因工程技术手段，从苏云金芽孢杆菌中获取抗虫基因Bt，将Bt基因转移到优质油菜中，培育出转基因抗虫的油菜品种。这一品种在生长过程中能产生特异性的杀虫物质，对菜青虫有显著的抗性，能大大减少农药的使用，保护农业生态环境。请根据以上信息分析，下列叙述中正确的是 [ ]
A.
该抗虫基因Bt的结构是间隔的、不连续的
B.
特异性的杀虫物质是某单克隆抗体
C.
基因Bt不需要逆转录酶作用就能表达
D.
抗虫油菜只能通过组织培养进行无性繁殖
【单选题】运用基因工程技术手段，从苏云金芽孢杆菌中获取抗虫基因Bt，将Bt基因转移到优质油菜中，培育出转基因抗虫的油菜品种。这一品种在生长过程中能产生特异性的杀虫物质，对菜青虫有显著的抗性，能大大减轻农药的使用，保护农业生态环境。根据以上信息分析，下列叙述中正确的是 [ ]
A.
该抗虫基因Bt的结构是间隔的不连续的
B.
特异性的杀虫物质是某种抗体
C.
基因Bt不需要逆转录酶的作用就能表达
D.
抗虫油菜只能通过组织培养进行无性繁殖
【单选题】以下符合基因工程技术理念的是()
A.
根据人们需求，将人的T淋巴细胞与肿瘤细胞进行融合，获得杂交瘤细胞中包含淋巴细胞的抗性基因
B.
天然存在的噬菌体侵染大肠杆菌，并将其自身DNA融入到大肠杆菌基因组中
C.
用射线照射大肠杆菌，使其DNA序列发生改变，并产生新的性状
D.
将鱼的抗冻蛋白基因转入植物中获得抗寒的植物品系
【单选题】The passage suggests which of the following about the use of temporary employment by firms during the 190's?
A.
It enabled firms to deal with fluctuating product demand far more efficiently than they before the 1980's.
B.
It increased as a result of increased participation in the workforce by certain demograp groups.
C.
It was discouraged by government-mandated policies.
D.
It increased partly as a result of workers' reduced ability to control the terms of their employment.
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