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【判断题】
统计研究的个体就是对作物的某一性状或试验指标通过观察、测量所获得的一个观测值。相应的总体是某处理小区产量观测值的全体。根据总体全部个体计算所得的总体特征数称为参数, 总体参数通常用希腊字母表示,如总体平均数 μ ,总体标准差 σ 等。A.
正确
B.
错误
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举一反三
【单选题】Yeats was beginning to use a vocabulary freshly minted from the treasury of Gaelic literature, and many of the shorter poems in The Countess Kathleen and Various Legends and Lyrics (1892) deal with a ...
A.
Greek mythology
B.
the Arthurian legend
C.
Gaelic allusions
D.
the story of Fergus and Conchubar
【单选题】下列对生铁和钢的各项叙述中，正确的是（ ）
A.
生铁和钢都不是铁的合金
B.
生铁的含量一定比钢高
C.
钢的性能优于生铁，所以钢有着比生铁更广泛的用途
D.
生铁不是纯铁，而钢是纯铁
【单选题】In order for you to follow the schedule set by the publisher, your paper must be looked over over the weekend, revised, and handed in in its final form on Monday. What must you do on Saturday and Sund...
A.
meet the publisher
B.
examine your paper
C.
hand in a paper
D.
look over the weekend
【单选题】So far the gardeners ______ no instructions as to what to do next.
A.
have received
B.
have accepted
C.
have revised
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