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【简答题】
All materials radiate thermal energy in the form of electromagnetic waves. When this radiation falls on a second body, it may be partially reflected, transmitted, or absorbed. It is only the fraction that is absorbed that appears as heat in the body.
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【单选题】下列波长与频率关系描述错误的是
A.
波长与频率成反比
B.
频率越高,波长越短
C.
频率越低,波长越长
D.
频率越高,纵向分辨率越好
E.
波长与频率成正比
【判断题】波长和频率的关系是,频率越高,波长越长,频率越低,波长越短。
A.
正确
B.
错误
【单选题】Which of the following statements on the 30 people on board is CORRECT?
A.
They were all killed.
B.
They were all rescued by a helicopter.
C.
Some of them were rescued by fishing boat.
D.
It was not mentioned in the news.
【判断题】电磁波的波长×频率 = 光速。电波的波长越长频率越高,波长越短则频率越低。
A.
正确
B.
错误
【单选题】20GB 的U盘表示容量约为()。
A.
20 亿个字节
B.
20 亿个二进制位
C.
200 亿个字节
D.
200 亿个二进制位
【多选题】关于波长与频率的关系,哪些是正确的
A.
波长与频率成反比
B.
频率越高,波长越短
C.
频率越低,波长越长
D.
频率越高,纵向分辨率越好
E.
波长与频率成正比
【单选题】On December 26, 2004, a terrible tsunami happened in the Southeast Asia, _________ many people.
A.
killing
B.
had killed
C.
killed
D.
having killed
【单选题】关于长波、中波、短波的下列说法中正确的是 [     ]
A.
长波的波长较长、频率较高
B.
短波的波长较短、频率较低
C.
长波的波长较长、频率较低
D.
中波的波长较短、频率较高
【单选题】机器的日常保养维修项:( )
A.
每日保养
B.
每周保养
C.
每月保养
D.
每季保养
【判断题】电磁波的波长和频率成正比。波长越长,频率越高;波长越短,频率越低
A.
正确
B.
错误
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