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【简答题】
随机地从一批钉子中抽16枚，测得其长度(单位：cm)为： 2.14；2.10；2.13；2.15；2.13；2.12；2.13；2.10； 2.15；2.12；2，14；2，10；2.13；2.11；2.14；2.11． 设钉长服从N(μ，σ 2 )分布，取1-α=0.90，分别在两种情形下求μ的置信区间．并对α=0.1下检验H 0:μ =2.12．
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举一反三
【单选题】衡量电力系统运行经济性的主要指标是
A.
燃料消耗率、厂用电率、网损率
B.
燃料消耗率、建设投资、网损率
C.
网损率、建设投资、电压畸变率
D.
网损率、占地面积、建设投资
【简答题】将交流电流变换成单向脉动电流的过程叫( )。
【单选题】21-25题共用一篇文章 B A man had his name included in Guinness Book of World Record he had been married the most-29 times in his life. The man died of heart trouble on June 10. He died ten days before his ma...
A.
39hours
B.
7years
C.
less than one year
D.
19 days
【简答题】Two brothers worked together on a farm. One was married and had a large 51 . The other had no wife yet. Although they lived in different houses, they shared everything they got from their farm. One da...
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