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【单选题】
波在传播过程中遇到障碍物时能绕过其边缘,并继续前进的现象称为波的( )A.
叠加原理
B.
干涉
C.
折射
D.
衍射
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举一反三
【单选题】Which of the followings is the most reliable information source on line?
A.
comprehensive employment websites
B.
company official website
C.
commercial employment websites
D.
Wechat and Microblog
【单选题】The information source provides an electrical signal to a transmitter( )an electrical stage which drives an optical source to give modulation of the light wave carrier.
A.
comprising
B.
comprised
C.
to consist
【单选题】information source, transmission medium, electrical signal, electromagnetic wave
A.
信息源、电信号、 传输介质、 电磁波
B.
信息源、传输介质、电信号、电磁波
C.
传输介质、 信息源、电信号、电磁波
D.
信息源、传输介质、电磁波、 电信号
【单选题】Where can we spot the information source in a summary?
A.
at the beginning
B.
in the middle
C.
at the end
D.
anywhere
【简答题】运动技术的构成中动作要素有哪些？
【简答题】构成技术的基本要素主要有哪些？
【单选题】Experts report a new online information source for successful job seekers. What is this recently emerged online job source? ( )
A.
Big online job boards
B.
Online newspapers
C.
Public service Web sites
D.
Social media sites
【简答题】构成技术的基本要素主要有哪些？
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