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Taking operation of rational numbers as the carrier, this paper starts the research right from the study on multiplication of decimal, division of fraction and multiplication of rational numbers and studies the "understanding levels of operation of rational numbers and the teaching and learning strategies that matches them."

本论文以有理数运算作为载体，选取小数乘法、分数除法和有理数乘法作为研究的切入点，研究了&有理数运算的理解水平及其教与学的策略&，具体说来，研究了3个问题：(1)学生对有理数运算的理解达到怎样的水平；(2)学生达到某种理解水平的原因是什么；(3)基于学生的理解水平，有效的教与学的策略是什么。

In this paper, the functions of humic acid as agrochemicals, agrochemicals carrier, and its synergistic effect on agrochemicals are introduced.

介绍了腐植酸作为农药、农药的载体、农药的增效剂所具有的功能和作用，以及腐植酸作为一种天然化合物在未来农业持续发展中的环保作用。

Based on the analysis of present situation, this paper advances the approaches to maintaining advanced nature of the Party membership in colleges and universities: firstly, improving political awareness through persistent Party spirit education; secondly, improving the sense of honor and responsibility by cultivating campus culture; thirdly, providing the system safeguard by strengthening the evaluation mechanism; fourthly, innovating the carrier of advanced nature maintaining with the Image Improvement Program; fifthly, enhancing the selfdiscipline by implementing selfeducation, selfmanagement and selfsupervision.

笔者从党员教师先进性要求的内涵及现状分析着手，提出保持高校党员先进性的对策：（1）持之以恒地开展党性教育，提高党员教师的思想政治素质；（2）努力营造校园环境，提高党员教师的政治荣誉感和责任感；（3）健全考核机制，为保持党员个体先进性提供制度保障；（4）实施党员形象工程，创新党员保持先进性的载体；（5）启动自我教育、自我管理和自我监督标杆，增强党员教师自律意识。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。