Monday, November 6, 2023
Thursday, September 15, 2022
Friday, September 16, 2022
问题:用50%辛硫磷乳油拌种,若拌种的有效浓度为0.3%,100千克种子需50%的辛硫磷乳油(种子作稀释剂)的千克数为()A、0.3B、0.5C、0.6D、1.5
Thursday, September 15, 2022
Friday, September 16, 2022
Friday, September 16, 2022
问题:小麦黄矮病的传毒介体种类及主要传毒介体,病毒与介体之间的关系如何?
Wednesday, August 9, 2023
Thursday, September 15, 2022
问题:从综合防治的角度论述怎样才能防止或减少植物病虫害的发生。
Friday, September 16, 2022
Friday, September 16, 2022
问题:蝼蛄的前足是()。A、跳跃足B、开掘足C、捕捉足D、携粉足
Thursday, September 15, 2022
问题:昆虫具有()特点。A、胸足为4对B、胸足为3对C、无复眼D、无翅
Thursday, September 15, 2022
Thursday, September 15, 2022
问题:水稻纹枯病菌主要以菌核在土壤中越冬,也可以菌核或菌丝在病稻草、田边杂草上越冬。()
Thursday, September 15, 2022
Sunday, January 28, 2024
Thursday, September 15, 2022
Thursday, September 15, 2022
Monday, February 13, 2023
Wednesday, September 27, 2023
Thursday, September 15, 2022