未知题型 They questioned both Mr. Trump"s conservatism and his character, accusing him of lying, exploiting students and employing 19 to work on his properties.

未知题型 Can an inductive argument guarantee the truth of the conclusion if the premises are true? Why or why not?

未知题型 标准正态分布是μ=0并且σ=1的正态分布（ ）