问题:单选题湖泊的富营养化现象主要表现为( )。A 水质发黑B 形成岸边污染带C 水华D 赤潮E 水生生物大量繁殖...
Friday, November 17, 2023
问题:单选题适用于采集不活泼气体采样的是( )。A B C D E...
Friday, October 14, 2022
Thursday, January 4, 2024
问题:气相色谱分析,内标法定量中,选择的内标物时要求( )。...
Thursday, September 22, 2022
问题:单选题影响水质pH测定的因素是()。A 浑浊度B 温度C 游离氯D 氧化性E 还原性...
Thursday, September 21, 2023
问题:单选题人体每天叶酸需要量为( )。A 0.05~0.1mgB 0.2~0.4μgC 0.2~0.4mgD 0.2~0.4gE 1~2g...
Tuesday, October 11, 2022
Thursday, September 22, 2022
问题:单选题铁的每日适宜摄入量为( )。A B C D E...
Monday, January 29, 2024
问题:测定食品中水分需称量恒重,“恒重”是指同一份样品两次称量之差不超过()。...
Saturday, September 17, 2022
问题:采样效率太低的方法和仪器不能采用,一般认为,空气样品的采样效率最好不低于()。...
Wednesday, September 21, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
问题:国标法规定测定食品中有机磷,用气相色谱法,使用的检测器为( )。...
Friday, September 23, 2022
Thursday, September 22, 2022
Thursday, September 15, 2022
问题:单选题维生素D的每日需要量为( )。A B C D E...
Saturday, May 4, 2024