Thursday, September 22, 2022
黄瓜的生育周期可分为发芽期()甩条发棵期和结果期四个时期。...
Tuesday, September 20, 2022
Thursday, September 15, 2022
Saturday, September 17, 2022
当结球甘蓝的外叶增长到一定数量,早熟品种15~20片,中熟品种20~30片,晚熟品种30片以上时即开始()...
Tuesday, September 20, 2022
单选题被子植物的各种分类方法中,最重要的方法是:()A 细胞学的方法B 形态学的方法C 解剖学的方法D 植物化学的方法...
Thursday, February 29, 2024
Thursday, September 22, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
设施果树栽培常用的控制树冠的方法有起垄栽培、容器限根、垫根栽培、根系修剪、应用生长调节剂和()。...
Thursday, September 22, 2022
Thursday, September 22, 2022
Wednesday, September 21, 2022
问答题植物病害发生应具备哪些基本因素,这些因素是如何导致植物生病的?...
Wednesday, November 1, 2023
Monday, August 8, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
填空题番茄果实成热大体分为4个时期、即绿熟期、成熟期、转色期和()。...
Thursday, January 25, 2024
病原物的侵染过程分为哪几个时期?各时期的影响因素有哪些?...
Sunday, September 18, 2022
Wednesday, September 14, 2022
Thursday, September 15, 2022