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昆虫的消化系统包括()和有关的()。昆虫的呼吸器官由()、()和...
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HCHO无法与NaHSO<sub>3</sub>发生加成反应。...
Sunday, September 11, 2022
秋季是露地栽培西洋芹的主要季节,生产的关键是苗期注意()和肥水管理。...
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Sunday, September 11, 2022
Sunday, September 11, 2022
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以甲苯为原料进行硝代反应时,主要产物为邻硝基甲苯和对硝基甲苯。...
Saturday, September 17, 2022
杧果花期要求干燥温暖天气、降水和高的湿度不利于授粉和坐果,引起(...
Saturday, September 17, 2022
温室内不能正常生产,是指温室内温度超过()A、29℃B、31℃C、33℃D、35℃...
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堆肥调整C/N,以使其分解速度快,腐殖质形成较多,一般是()。...
Sunday, September 11, 2022
佛尔哈德法是采用K<sub>2</sub>CrO<sub>4</...
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Saturday, September 17, 2022
番木瓜充苗方法有:实生、扦插和组织培养三种,但目前在生产中最常用的是()。...
Wednesday, August 23, 2023