Monday, June 26, 2023
Tuesday, April 16, 2024
Monday, September 12, 2022
问题:农药的毒性分()。按我国农药毒性分级标准,急性经皮的致死中量LD50分别为()时,其毒性分别为高毒、中等毒和低毒。
Thursday, September 15, 2022
Saturday, November 25, 2023
问题:农药毒性试验分别以下四个阶段:第一阶段:();第二阶段:();第三阶段:();第四阶段:()。
Monday, April 22, 2024
Wednesday, October 25, 2023
问题:小菜蛾几乎对现有的各类药剂都抗药性,这是属于()A、行为抗性B、交互抗性C、负交互抗性D、多抗性
Friday, March 15, 2024
Wednesday, October 25, 2023
Monday, March 18, 2024
Monday, March 18, 2024
问题:沙蚕毒素类农药在()、()等作物上不能使用,因为产生药害。
Monday, April 22, 2024
问题:锈病和白粉病虽然表现的症状不同,但是它们都可以用同种药剂防治。
Monday, March 18, 2024
Saturday, February 4, 2023
Sunday, May 7, 2023
Thursday, September 15, 2022
Monday, February 13, 2023
问题:有机磷类杀虫剂占中国杀虫剂市场的60%以上分额,占有的比份最大。
Wednesday, October 25, 2023
Friday, March 15, 2024
问题:光稳定菊酯型拟除虫菊酯可以在田间防治农业害虫,又称农用拟除虫菊酯,近几年导入含()原子,提高活性,而且对螨表现高毒效。A、氟B、氯C、溴D、氮
Monday, March 18, 2024