多项选择题根据模态命题间的对当关系,若已知必然p真,则可推知( )。 A、“必然非p”假 B、“可能非p”假 C、“可能p”真 D、“可能p”真假不定
多项选择题What shall be written in the INTRODCUTION of a paper? A、Statement about the background B、Your research field C、Your purpose of doing the research D、Your research material