“食用菌”是林业专业的一门选修课,在课时少,内容多的情况下,如何加强实践教学,帮助学生掌握食用菌的栽培技术,这是近几年来我在教学中经常探索的新课题。这里谈几点体会,
Using a column crystallizer to separate and purify naphthalene in the continuous multistage countercurrent fractional operation.The principle and characteri
文章对既有线电气化铁路接触网进行改造能够有效提升铁路的运输效率,在接触网改造施工中,线路和接触网设备存在相互影响作用,需要在进行接触网改造工作前做好协调工作,有效提
目前国内外对二倍体大白菜雄性不育系的创制已进行了深入的研究,利用雄性不育系技术育种已相对成熟,而四倍体大白菜育种仍以突破稔性、提高结籽率的自交系选育为主,四倍体雄
Electrochemically switched ion separation (ESIX) is an ecologically benign and economic way via reversible electrochemical modulation of the matrix charge d
Objective Prior pulmonary tuberculosis (PTB) on chest X-ray (CXR) was commonly found in infertile patients receiving examinations before in vitro fertilization
高寒地区青花菜栽培技术丽江地区农科所674100王绍林青花菜属绿色蔬菜类,含有极丰富的营养成分。据测定,青花菜蛋白质含量是番茄的4倍,白花菜的3倍;维生素C的含量是番茄的5倍,白花菜的43倍。由
莺啼如歌,蝶飞若舞;翩翩者鵻,载飞载下.每逢花朵盛开的季节,一对对,一群群“舞入梨花何处寻”以其缤纷多彩的外衣点缀着春机勃发的大自然,让人陶醉在春天的怀抱里.庄周梦蝶,
It is well known that separation of adjacent lanthanide elements,such as Pr and Nd,is very difficult because of their extremely similar physical and chemica
黄瓜新法嫁接──串接温棚黄瓜传统嫁接方法具有易感染枯萎病,成活率低的缺点。特点是没有经验,初次操作,成活率更低,甚至是"全军覆灭"。用串接法则完全可避免以上缺点,成活率大大提