【单选题】联系的客观性和普遍性原理的方法论意义在于
【单选题】联系的客观性和普遍性原理的方法论意义在于:
D.
启示人们要有大格局,用长远眼光看世界、想问题
【多选题】下列关于无失真传输的说法正确的是
A.
若系统的输入为 e (t) ,输出 r (t)= K e(t-t0) ,其中 K 、 t0 是常数,则该系统是无失真传输系统。
B.
在信号的全部频带内,无失真系统要求频率响应 H (j w ) 的幅度特性是一常数。
D.
无失真传输只要求系统频率响应 H (j w ) 的幅度特性是一个常数,对相位特性没有要求。
【简答题】No sooner ______ (we arrive) at our house than it started to rain.
【单选题】As she is a _____ visitor to our house, we look on her as a part of our family.
【判断题】在旅游团抵达B市时,如有行李托运,全程导游应将旅游团行李托运单交给B市行李员。( )
【单选题】The family have seen or visited all the following in Istanbul EXCEPT______.
D.
shopping mall boutiques
【单选题】Which of the following materials is NOT appropriate for a teacher to use in listening practice?
A.
Materials with different dialects.
B.
Comprehensible authentic materials.
C.
Materials with comprehensible new words for students.
D.
Materials with contents beyond students' comprehension capacity.
【单选题】-Welcome to our house! -Oh, what a nice house! It' s much bigger than _______. [ ]
【判断题】系统无失真传输要求系统频率响应的幅度特性是一常数,相位特性是一过原点的直线。()