【判断题】无公害农产品、绿色食品、有机食品都施化学肥料。
【简答题】A.related B.concentrated C.entitled D.assigned
【单选题】容积式流量计检定规程规定,流量计各流量点的重复性应不超过流量计重复性的()。
【单选题】Subjects are said to be assigned randomly when
A.
they are assigned to experimental and control groups from a sample which is representative of the larger population.
B.
they each have an equal chance of being assigned to either the experimental or control group.
C.
they are assigned to experimental and control groups so that the groups differ on some critical variable before the experiment begins.
D.
neither the experimenter nor the subject knows whether the subject is in the experimental or control group.
【单选题】通过抑制真菌细胞膜合成而产生良好抗菌作用的是:
【简答题】基尼系数反映的是什么差异程度的数量界限?有何实际意义?
【简答题】A.conducted B.searched C.discussed D.assigned