问题:简单田间试验设计主要包括()、()、()、()。...
Monday, September 12, 2022
Wednesday, May 24, 2023
Thursday, September 15, 2022
Thursday, September 15, 2022
Monday, November 7, 2022
Friday, September 16, 2022
问题:下列关于桃细菌性穿孔病,错误的是()A、主要危害叶片B、不危害枝条和果实C、初期多在叶脉两侧产生水渍状小斑点D、后期病斑干枯脱落...
Thursday, September 29, 2022
Friday, September 16, 2022
问题:凡是由生物因子引起的植物病害都能相互传染,有侵染过程,称为()或(),也称寄生性病害。...
Thursday, September 29, 2022
Thursday, September 15, 2022
问题:蝗虫的口器是()A、刺吸式B、虹吸式C、咀嚼式D、锉吸式...
Monday, November 7, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Saturday, September 24, 2022
Thursday, November 17, 2022
Monday, September 12, 2022
问题:杂种优势产生的原因主要有两个假说,为()和()。...
Monday, September 12, 2022
问题:常规有性杂交育种中杂交后代选择方法有()、()和()。...
Thursday, September 15, 2022
Friday, September 16, 2022
问题:舞毒蛾又名(),其成虫雌雄(),雌体较大,污白色;雄体较小,棕褐色。...
Thursday, September 29, 2022