Sunday, March 26, 2023
Friday, September 16, 2022
Monday, October 30, 2023
国氟中毒病区分布特点,北方以()型病区为主,南方以()型病区为主,交汇区大致在长江以北,秦岭、淮河以南。...
Sunday, March 5, 2023
Monday, September 12, 2022
土壤污染物种类繁多,主要有三大类,即()、()和()。...
Thursday, September 15, 2022
Thursday, November 10, 2022
下面哪项不是酸雨的有害作用()。A、使皮肤癌的发生率增加B、破坏农田和植被的化学组成C、增加土壤中重金属的水溶性D、影响土壤中生物的生存E、增加输水管材中金属化合物的溶出...
Wednesday, May 3, 2023
过量的氟进入体内,可使大量的()沉积在正发育的牙组织中,致使牙釉质不能形成正常的棱晶结构,导致氟斑牙。...
Monday, February 13, 2023
化学耗氧量(chemical oxygen demand COD)...
Friday, March 3, 2023
下列描述中,哪一条不属于重大突发环境污染事件(Ⅱ级)的构成条件(...
Friday, September 16, 2022
Monday, February 13, 2023
Wednesday, May 3, 2023
Thursday, September 15, 2022
Friday, September 16, 2022
Sunday, September 11, 2022
Monday, February 20, 2023
射频辐射是指()。A、高频电磁场和微波B、高频电磁场和紫外线C、高频电磁场和激光D、微波和激光E、激光与X射线...
Tuesday, June 20, 2023