The growth of Maesopsis under the influence of various geomorphic surfaces was followed within a period of 70 months. Young plants of two months old were transp
呼吸困难是指主观上感到呼吸费力及不适感,客观上表现出呼吸节律、频率、呼吸深度、以及是否有辅助呼吸肌肉参与呼吸动作等改变。 因呼吸困难而被迫采取坐位,称为端坐呼吸。
The crude polysaccharide UPOJ was extracted by ultrasound from Ophiopogon japonicas and purified by DEAE-cellulose52 column and Sephadex G-150 gel column. Purif
运用GTAP模型模拟中国发生资本流动逆转的情景，评估在不存在银行危机的情况下不同规模的资本流动逆转对实体经济的短期影响，验证了资本流动逆转影响实体经济的论断。研究表明，资
不少学生都怕写作文,因为缺少写作素材,无米下锅。在作文教学实践中,我试着把语文教材引进写作教学,取得了较好的效果。语文教材多为名篇经典,我引导学生熟读课文,从中选择、
我的世界很大很大．除了我全都是书：我的世界很小很小。除了我就只有书。
Strong light decreases the rate of photosynthesis and assimilates production of crop plants. Plants with different carbon reduction cycles respond differently t
Innovative ability is an important indicator for judging the effectiveness of the national agricultural science and technology park construction. Based on the s
Previously we found that a strain of Myrothecium verrucaria (MV) exhibited bioherbicidal activity against several important weeds, and that some commercial form
雪花悠然地飘落下来,是这一年的第一场雪。一片,两片,三片,雪花飘飘摇摇落下来,最后整个天空都泛白。它们是那样洁白,那样轻盈,那样可爱。它们轻吻着大树光秃却很写意的枝丫,