排序方式： 共有6条查询结果，搜索用时 125 毫秒
1
1.
Reduction of hydrocarbon contamination on viability of <Emphasis Type="Italic">Acartia pacifica</Emphasis> benthic resting eggs 总被引：2，自引：0，他引：2
The potential effect of hydrocarbon contamination on the hatching success of benthic resting eggs of Acartia pacifica in Xiamen Bay was investigated experimentally. The number of nauplii emerging from the sediment samples decreased with increasing Fuel Oil #0 concentration. The estimated rate of mortality increased markedly with the increase of Fuel Oil #0 concentration. Successive fuel Oil #0 concentrations from 50 mg/kg to 5000 mg/kg reduced the number of hatched nauplii by 3.8% -100%. The mortality of A. pacifica resting eggs due to Fuel Oil #0 contamination did not significantly increase as time progressed at each concentration level. The LC50 values of resting eggs, changing from 237.12 to 279.59 mg/kg, remained at an almost stable level in two months. The number of A. pacifica nauplii that hatched from the sediment at 10℃ was higher than those from the sediment at 30℃, which indicates that the toxicity of Fuel Oil #0 on A. pacifica resting eggs increases with increasing temperature. 相似文献
2.
《义务教育地理课程标准(2011)》提出"义务教育地理课程是一门兼有自然学科和社会学科性质的基础课程,具有区域性、综合性、思想性、生活性、实践性的特征"。地理课程的"生活性"表现为"地理课程内容紧密联系生活实际,突出反映学生生活中经常遇到的地理现象和可能遇到的地理问题,有助于提升学生的生活质量和生存能力"。这是由于地理课程有利于增强学生生活能力,更大程度满足学生生存的需要,用学到的地理知识、技能、原理来理解和解释生活现象,解 相似文献
3.
4.
2003年教育部制定出版的《高中地理课程标准》明确提出要重视对地理问题的探究，倡导自主学习、合作学习和探究学习，最终达到增强学生的地理学习能力和生存能力的目的。 相似文献
5.
航母从诞生之日起,就存在诸多致命的弱点。即便是当今最先进的大型核动力航母,在特定环境下也有可能像"缓慢移动的靶标"般脆弱。 相似文献
6.
1