为了给炉霍县养牛业健康发展提供寄生虫病防治指导与保障,采用粪便检查法对采集自四川省炉霍县部分地区的725份牛粪便样品进行消化道线虫和球虫感染情况调查。结果显示,牛消化道线虫和球虫的总感染率为23.0%(167/725)。其中,线虫的感染...为了给炉霍县养牛业健康发展提供寄生虫病防治指导与保障,采用粪便检查法对采集自四川省炉霍县部分地区的725份牛粪便样品进行消化道线虫和球虫感染情况调查。结果显示,牛消化道线虫和球虫的总感染率为23.0%(167/725)。其中,线虫的感染率为6.6%(48/725),平均每克粪便虫卵数(eggs per gram of feces,EPG)为129个;球虫感染率为16.4%(119/725),平均每克粪便卵囊数(oocysts per gram of feces,OPG)为244个,且无混合感染现象。在3个品种的牛群中,各个年龄段均存在线虫感染,不同品种牛的易感年龄有显著差异。球虫感染在各个年龄段均有发生,其感染率和感染强度随着年龄的增长呈下降趋势。在不同饲养方式方面,放养和半放养牦牛种群之间线虫的感染率存在极显著差异(P<0.01),而球虫的感染率差异不显著(P>0.05)。此外,线虫和球虫的感染率和感染强度在3个地区有显著差异(P<0.05),这可能与饲养环境有关。调查结果表明,当地牛普遍存在线虫与球虫感染,建议区域内牛场加强肠道寄生虫的监测工作,适时对牛群进行针对性驱虫。展开更多
批判性思维是初中生综合素质的重要组成部分。培养批判性思维已被确立为现代教育追求的目标之一。将批判性思维运用到英语写作教学中,增强了分析的有效性,增强了写作的逻辑性,决定了写作的个性化。它可以应用于段落和章节结构。根据相...批判性思维是初中生综合素质的重要组成部分。培养批判性思维已被确立为现代教育追求的目标之一。将批判性思维运用到英语写作教学中,增强了分析的有效性,增强了写作的逻辑性,决定了写作的个性化。它可以应用于段落和章节结构。根据相关理论基础和实践需要,本文提出了在英语写作教学中培养批判性思维能力的策略。具体策略包括将批判性思维培养为创新思维、加强元认知策略训练、适当使用头脑风暴方法、用批判性思维考察批判性章节、选择真实的写作和阅读、采用内容与形式相结合的多元化反馈模式等。Critical thinking is an important part of junior high school students’ comprehensive quality. Cultivating critical thinking has been established as one of the goals of modern education. The application of critical thinking to English writing teaching enhances the effectiveness of analysis, enhances the logic of writing, and determines the individualization of writing. It can be applied to paragraph and chapter structures. According to the relevant theoretical basis and practical needs, this paper puts forward some strategies for cultivating critical thinking ability in English writing teaching. Specific strategies include cultivating critical thinking into innovative thinking, strengthening metacognitive strategy training, appropriately using brainstorming methods, examining critical chapters with critical thinking, choosing authentic writing and reading, and adopting diversified feedback modes combining content and form.展开更多
The major,trace,and rare earth elements of the Duanjiapo(DJP)section in the south of the Loess Plateau,the Jiaxian(JX)section in the north,and the Jiuzhoutai(JZT)section in the west are studied.The results show that t...The major,trace,and rare earth elements of the Duanjiapo(DJP)section in the south of the Loess Plateau,the Jiaxian(JX)section in the north,and the Jiuzhoutai(JZT)section in the west are studied.The results show that the main elemental characteristics of loess in three profiles are consistent with the upper continental crust(UCC).In terms of trace elements,Th,Nb,Zr,Hf,Y,Cs,W,Cr,V,Li,and Pb show relative enrichment compared with UCC;Rb,Ba,Sr and Be exhibit relative depletion.The average ofΣREE is 171.91ppm with a negative anomaly forδEu and essentially no anomaly forδCe.The results of K_(2)O/Na_(2)O,Rb/Sr ratios,as well as the leaching co-efficient from three profiles,indicate DJP>JX>JZT,suggesting that DJP experiences the strongest weathering leaching effect.The chemical index of alteration(CIA)reveals that all three profiles of loess are in the primary stage of Ca and Na depletion.DJP is generally in the early to moderate stage of chemical weathering,while JX and JZT are both in the early stage.展开更多
文摘为了给炉霍县养牛业健康发展提供寄生虫病防治指导与保障,采用粪便检查法对采集自四川省炉霍县部分地区的725份牛粪便样品进行消化道线虫和球虫感染情况调查。结果显示,牛消化道线虫和球虫的总感染率为23.0%(167/725)。其中,线虫的感染率为6.6%(48/725),平均每克粪便虫卵数(eggs per gram of feces,EPG)为129个;球虫感染率为16.4%(119/725),平均每克粪便卵囊数(oocysts per gram of feces,OPG)为244个,且无混合感染现象。在3个品种的牛群中,各个年龄段均存在线虫感染,不同品种牛的易感年龄有显著差异。球虫感染在各个年龄段均有发生,其感染率和感染强度随着年龄的增长呈下降趋势。在不同饲养方式方面,放养和半放养牦牛种群之间线虫的感染率存在极显著差异(P<0.01),而球虫的感染率差异不显著(P>0.05)。此外,线虫和球虫的感染率和感染强度在3个地区有显著差异(P<0.05),这可能与饲养环境有关。调查结果表明,当地牛普遍存在线虫与球虫感染,建议区域内牛场加强肠道寄生虫的监测工作,适时对牛群进行针对性驱虫。
文摘批判性思维是初中生综合素质的重要组成部分。培养批判性思维已被确立为现代教育追求的目标之一。将批判性思维运用到英语写作教学中,增强了分析的有效性,增强了写作的逻辑性,决定了写作的个性化。它可以应用于段落和章节结构。根据相关理论基础和实践需要,本文提出了在英语写作教学中培养批判性思维能力的策略。具体策略包括将批判性思维培养为创新思维、加强元认知策略训练、适当使用头脑风暴方法、用批判性思维考察批判性章节、选择真实的写作和阅读、采用内容与形式相结合的多元化反馈模式等。Critical thinking is an important part of junior high school students’ comprehensive quality. Cultivating critical thinking has been established as one of the goals of modern education. The application of critical thinking to English writing teaching enhances the effectiveness of analysis, enhances the logic of writing, and determines the individualization of writing. It can be applied to paragraph and chapter structures. According to the relevant theoretical basis and practical needs, this paper puts forward some strategies for cultivating critical thinking ability in English writing teaching. Specific strategies include cultivating critical thinking into innovative thinking, strengthening metacognitive strategy training, appropriately using brainstorming methods, examining critical chapters with critical thinking, choosing authentic writing and reading, and adopting diversified feedback modes combining content and form.
基金the National Natural Science Foundation of China(No.41561001,42271007).
文摘The major,trace,and rare earth elements of the Duanjiapo(DJP)section in the south of the Loess Plateau,the Jiaxian(JX)section in the north,and the Jiuzhoutai(JZT)section in the west are studied.The results show that the main elemental characteristics of loess in three profiles are consistent with the upper continental crust(UCC).In terms of trace elements,Th,Nb,Zr,Hf,Y,Cs,W,Cr,V,Li,and Pb show relative enrichment compared with UCC;Rb,Ba,Sr and Be exhibit relative depletion.The average ofΣREE is 171.91ppm with a negative anomaly forδEu and essentially no anomaly forδCe.The results of K_(2)O/Na_(2)O,Rb/Sr ratios,as well as the leaching co-efficient from three profiles,indicate DJP>JX>JZT,suggesting that DJP experiences the strongest weathering leaching effect.The chemical index of alteration(CIA)reveals that all three profiles of loess are in the primary stage of Ca and Na depletion.DJP is generally in the early to moderate stage of chemical weathering,while JX and JZT are both in the early stage.
