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【单选题】
关于影像的放大，正确的叙述是（）A.
在X线投影中，影像只有几何尺寸的改变时，称为影像的放大
B.
物-片距越小，放大率越大
C.
焦-片距越大，放大率越大
D.
有效焦点越小，放大率越大
E.
以上都是正确的
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举一反三
【单选题】电路如图所示,输入信号 u i =1.414 sinwt V ,则输出电压 u O 为 ( ) 。
A.
2 × 1.414 sinwt V
B.
1.414 sinwt V
C.
- 2 × 1.414 sinwt V
【单选题】What can you infer from the passage?
A.
Liberal arts graduates have had fewer job opportunities than science or engineering graduates over the past few years.
B.
Not having a clear idea of what types of job they can do is quite common among liberal arts graduates.
C.
Liberal arts graduates have very few career options for them to choose from.
D.
In job hunting college graduates who know what they could do for an employer are more likely to succeed.
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