一阶非齐次线性方程的通解=对应齐次方程通解+自身的一个特解()
创新是指人们为了发展的需要,运用已知的信息,不断突破常规,发现或产生某种新颖、独特的有社会价值或个人价值的新事物、新思想的活动()
Which of the following is appropriate to describe communication()
A. systematic
B. continuous
C. irreversible
D. symbolic
Which of the following is element of communication()
A. participants
B. noise
C. channels
D. context