题目内容

下列公式中不是合取范式的是( )。

A. p∧q
B. ﹁p
C. p∨(﹁p∧r)
D. p∨q∨r

查看答案

搜索结果不匹配？点我反馈

更多问题

已知矿砂的标准镍含量为3.25%，某批矿砂的5个样品中的镍含量经测定为（%）3.23,3.27,3.24,3.28,3.24设测定值服从正态分布。问在显著水平α=0.01下，能否认为这批矿砂的镍含量符合标准？

一种燃料的辛烷等级服从正态分布，其平均等级为98.0，标准差为0.8，现从一批新油中抽出25桶，算得样本均值为97.7。假定标准差与原来一样，问新油的辛烷平均等级是否比原来燃料的平均等级偏低。（α=0.05）

1 When do people come into your life “for a reason”?

A. When they know you well.
B. When you need them in life.
C. When you can support their career.
D. When they are willing to listen to your troubles.

2 Who will end the friendship with the person that is in your life for a reason?

A. The person himself.
B. You.
C. Neither you nor the person.
D. Both you and the person.