Thursday, March 14, 2024
Thursday, March 14, 2024
Monday, May 6, 2024
Sunday, March 31, 2024
Sunday, March 31, 2024
Thursday, March 14, 2024
问题:用自来水饲养观赏鱼,需要除掉水中的游离氯,否则鱼会引起中毒甚至死亡。除氯的常用方法是()A、曝气B、加少量食盐C、加少量高锰酸钾D、给水加温
Sunday, April 21, 2024
问题:被称为活化石的观赏鱼是(),初学养鱼者首选品种是(),个体最大的淡水观赏鱼是()。
Sunday, March 31, 2024
问题:红色金鱼缺少()色素细胞;白色金鱼黑色素和()色素细胞都消失。
Sunday, April 21, 2024
Friday, December 8, 2023
问题:鲇鱼类多属(),眼睛很多已经退化,()较发达,成了它们在水底寻觅的主要的感觉器官。
Sunday, August 20, 2023
Sunday, May 28, 2023
Wednesday, March 27, 2024
Sunday, March 31, 2024
Monday, May 6, 2024
Sunday, March 24, 2024
Wednesday, March 27, 2024
Sunday, April 21, 2024
Sunday, April 21, 2024
Monday, May 6, 2024