患者,男,56岁。胃小弯溃疡穿孔行Billroth Ⅱ式胃大部切除术后第3天,剧烈咳嗽后突发上腹部剧痛,呈持续性,无阵发加剧。后发热,最高体温39.5℃。查体:上腹明显压痛反跳痛,尤以右上腹为甚,腹部无移动性浊音,肠鸣音寂然。 本例最可能的诊断是
A. 膈下脓肿
B. 十二指肠残端破裂
C. 急性完全性输入襻梗阻
D. 急性完全性输出襻梗阻
The promise of finding long-term technological solutions to the problem of world food shortages seems difficult to fulfill Many innovations that were once heavily supported and publicized have since fallen by the wayside. The proposals themselves were technically feasible, but they proved to be economically unenviable and to yield food products culturally unacceptable to their consumers.One characteristic common to unsuccessful food innovations has been that, even with extensive government support, they often have not been technologically adapted or culturally acceptable to the people for whom they had been developed. A successful new technology, therefore, must fit the entire sociocultural system in which it is to find a place Security of crop yield, practicality of storage, and costs are much more significant than what had previously been realized by the advocates of new technologies.The adoption of new food technologies depends on more than these technical and cultural considerations; economic factors and governmental policies also strongly influence the ultimate success of any innovation. Economists in the Anglo-American tradition have taken the lead in investigating the economics of technological innovation. Although they exaggerate in claiming that profitability is the key factor guiding technical change -- they completely disregard the substantial effects of culture—they are correct in stressing the importance of profits. Most technological innovations in agriculture can be fully used only by large landowners and are only adopted if these profit-oriented business people believe that the innovation will increase their incomes, Thus innovations that carry high rewards for big agribusiness groups will be adopted even if they harm segments of the population and reduce the availability of food in a country. Further, should s new technology promise to alter substantially the profits and losses associated with any production system, those with economic power will strive to maintain and improve their own positions. Therefore, although technical advances in food production and processing will perhaps be needed to ensure food availability, meeting food needs will depend much more on equalizing economic power among the various segments of the populations within the developing countries themselves. The phrase "fall by the wayside" in the second sentence, Paragraph t means"()".
A. decrease
B. fail to continue
C. cancel
D. forget
患者,男,40岁,3年前确诊为慢性粒细胞白血病。近1月持续高热、脾Ⅲ度肿大。血常规检查:Hb60g/L,WBC25×109/L,PLT55×109/L。骨髓检查:原粒细胞占35%。 最可能的诊断是
A. 慢性粒细胞白血病并感染
B. 慢性粒细胞白血病急性变
C. 慢性粒细胞白血病加速期
D. 慢性粒细胞白血病合并血吸虫病