箭与歌     

H.W.Longfellow  胡瑞明 《中学生英语》2003,(20)

我向空中射出一枝箭,我不知它落在何方。因为它飞得如此神速,我的视力都追赶不上。我向高空唱出一支歌,我不知它落在何方。谁有如此犀利眼力,能追赶上歌声的飞扬?  相似文献   

Early transition into adult roles: some antecedents and some outcomes     

Howell FM  Frese W 《American educational research journal》1982,19(1):51-73

The transition to adult roles usually occurs within a normative age span. By focusing on preadolescence to late adolescence using 2-wave panel data, this research seeks to develop a more informed picture of how "early" exit from the student role and "early" entry into the adult role of parent or spouse reflect factors operating prior to adolescence. The short term consequences of adult role transition on teenage status aspirations, life plans, other psychological orientations, and parental influence are also examined. Even though multiple role transition is frequently observed, only leaving school early appears to be related to preadolescent career decisions and academic performance in high school. The determinants of early transition to the role of parent or spouse do not appear to be socioeconomic origins, parental child rearing techniques or other specific influences, academic ability or performance, or preadolescent aspirations, as has generally been hypothesized in the literature. Research dilemmas and policy implications are discussed.  相似文献   

两根彩带哪根长     

耳名 《课堂内外(小学版)》2002,(1)

一天,羊爸爸到城里去。临走时,留下一道题让小白羊和小灰羊做:有两根彩带,第一根剪去1/5米,第二根剪去1/5,哪根剩  相似文献   

莱布尼茨和柏林科学院的创立     

Hartk.  W 周志家 《科学学译丛》1990,(5):23-27

  相似文献   

海军的新型声纳会伤害鲸鱼吗     

MichaelW．Robbins  张帆 《科学与生活》2003,(5):65-65

经过多年的争论，国家海洋渔业机构于去年夏天批准美国海军使用新型低频声纳系统查找敌方潜艇的位置。这一许可促使自然资源保护委员会和一个由其他环境组织组成的联盟向联邦法院控告海军，称这种声纳将对海洋生命造成巨大的危害。  相似文献   

模拟碳的地球化学循环     

RobertA．Berner  AntonioC．Lasaga  石实译  韩德华 《科学中国》1989,(7):15-19

引起大气二氧化碳缓慢增加的自然界地球化学过程，通过温室效应很可能引起了过去全球变暖的一些地质时期的出现。  相似文献   

等离子体粒子加速器     

JohnM．Dawson  黄炜译  王世德 《科学中国》1989,(7):11-14

等离子体中产生的电场能够使电子加速以获得高能。这个方法可望使场强比能量最大的传统加速器的场强高出10，000倍。  相似文献   

太阳能电池     

D．E 《科学中国》1990,(12):76-77

可弯曲的轻质太阳能电池展开竞争  相似文献   

探反物质     

迈克尔．莫耶  陈仁怀 《科技新时代》2002,(6):67-71

  相似文献   

The information requirements and information-seeking behaviours of health and social care professionals providing care to children with health care needs: a pilot study     

Jackson R  Baird W  Davis-Reynolds L  Smith C  Blackburn S  Allsebrook J 《Health information and libraries journal》2007,24(2):95-102

OBJECTIVES: The objectives of this work were to identify the sources of information currently received, information-seeking behaviours, information requirements and preferences for future information provision amongst health and social care professionals providing care to children with health care needs. METHODS: Data were collected using a cross-sectional postal questionnaire survey. RESULTS: A wide range of information resources was reported as being available to professionals. However, a large proportion of respondents found it necessary to perform additional searches for information, suggesting that current resources were not satisfying their needs. The majority of professionals reported a preference for electronic formats, whilst a smaller proportion preferred hard copy materials. Participants promoted the use of informal networks as a means of support and exchange of information. CONCLUSION: Supplementing the information that is provided in electronic and hard copy formats, by enhancing informal networks, may be the most effective way of meeting the information needs of this group of professionals.  相似文献