问题:内激素是()。A、性诱剂B、蜕皮激素C、脑激素D、示踪激素
Thursday, September 15, 2022
问题:不全变态的昆虫个体发育一般为()A、一个阶段B、两个阶段C、三个阶段
Saturday, September 17, 2022
Thursday, September 15, 2022
Monday, February 13, 2023
Tuesday, November 29, 2022
Thursday, September 15, 2022
问题:植物病毒流行的基本条件不包含()。A、病原物B、寄主C、环境条件D、病原媒介
Thursday, September 15, 2022
问题:()是鉴别病原物和诊断病害的重要依据。常见的病征多属真菌的()和(),而细菌性病害的病征多为( 胶状菌脓 )。
Thursday, September 15, 2022
Thursday, December 29, 2022
Sunday, April 30, 2023
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, October 13, 2022
问题:昆虫头部的主要功能是()。A、感触B、感触和取食C、运动D、代谢
Tuesday, August 8, 2023
问题:计算题:已知国槐尺蛾卵的发育起点温度为8.5℃,卵期有效积温为84日度,卵产下当时的平均温度为20℃。求:幼虫的发生期?
Thursday, September 15, 2022
问题:小麦白粉病病害大流行年份的菌源主要来自()。A、当地越冬病菌B、外来菌源C、外来病种D、种子
Wednesday, August 9, 2023