题型:名词解释 There was a loud scream from the backstage immediately after the concert ended, ______? [ ]A. wasn't there B. was there C. didn't it D. did it 查看答案
题型:名词解释 欲比较A、B、C三种药物对雄性Wistar大鼠尿中氨基氮排出量的影响,将36只大鼠按照体重和月龄相近的原则每3只为1区组,共12区组,每个区组的3只大鼠随机分配到A、B、C三个药物组。一个月后观察尿中氨基氮的排出量。若检验水准定为0.05,欲比较不同三种药物对大鼠尿中氨基氮排出量的影响,界值应为()A.B.C.D.E. 查看答案