番茄种子采收新法以往番前采种是待成熟收回后用手工挤出种子，这种方法如果是少量种子还可以，大量种子就太费工了。现介绍一种新方法：把收回的番茄通过后熟后，用菜刀削成０．５—１厘米厚
时代在进步,人们的生活质量也越来越高,家长对学生的教育随之也越来越重视.小学各科中,数学作为一门逻辑性较强的科目,其重要性得到了广大教师、学生、家长的认同.数学思维强
1 973.4前言本季度报告叙述背负式AN/PRC-70无线电台在1972年10月1日至1973年1月1日期间所进行的研制工作情况。本季度所做的主要工作集中在对该电台分系统进行初步测试。测
The aim of this study is to use a very small amount of extraction solvents and select the low toxicity extraction solvents with simple preconcentration proc
Erythropoietin (EPO) is an important therapeutic protein and can be also used as doping reagent in sports.Due to the presence of a large number of glycoprot
A. Dora saves a little of her money each week.rnB. After saving for a year, you would have more than $100.rnC. Costs are money you spend buying things.rnD. Savi
随着“新一轮基础教育课程改革”的实施与深入,越来越多的教师开始重视学生的语言积累问题.教师通过加强对语言要素知识的讲解,加强对语言组织和表达能力的训练,使学生在读写
Fuel gas is a general term for any of gas burned to produce thermal energy, including natural gas, liquefied petroleum gas, coal gas, and biogas and so on.F
趣味化学实验对学生具有较强的带动作用，既能够提升参与化学实验的积极性，又能够体现出学生的生本地位，可以将其应用n在初中化学教学中，如创设生活情境、引导课外自主开展化学实
The analysis of carbohydrates is one of the important issues in biological/clinical diagnoses since carbohydrates play important roles in biological functio