s平面期望闭环极点的ζ=0.714,自然频率ωn=10rad/s,采样时间为T=0.1s,则采用极点配置法设计z平面的期望闭环极点为（ ) A: 0.376±j0.326 B: 0.326±j0.376 C: 0.37±j0.32 D: 0.32±j0.37

甲、乙、丙、丁四个国家的基尼系数分别是0.376、0.491、0.315、0.408。依上述数据判断，这四个国家收入的分配情况是( )。 A: 甲比乙平等 B: 乙比丁平等 C: 丁比甲平等 D: 甲最平等

s平面期望闭环极点的ζ=0。714，自然频率ωn=10rad/s，采样时间为T=0。1s，则采用极点配置法设计z平面的期望闭环极点为多少？ （ ）。 A: 0.37±j0.32 B: 0.376±j0.326 C: 0.32±j0.37 D: 0.326±j0.376

饲料转化效率的遗传力0.35，标准差0.2；公畜和母畜的选种准度为0.8和0.5；公畜和母畜的选种强度为2.4和1.5；公畜和母畜的世代间隔均为1.8。则年度进展为？（） A: 0176 B: 0.088 C: 0.188 D: 0.376

A study is being conducted in which the health of two independent groups of ten policyholders is being monitored over a one-year period of time. Individual participants in the study drop out before the end of the study with probability 0.2 (independently of the other participants). Calculate the probability that at least nine participants complete the study in one of the two groups, but not in both groups? A: 0.096 B: 0.192 C: 0.235 D: 0.376 E: 0.469