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【单选题】
下面对于“图像大小”与“画布大小”命令间的区别,描述正确的是下面哪一项A.
“画布大小”命令可以改变图像分辨率,而“图像大小”则不可以
B.
“画布大小”命令可以在改变图像长宽比时,改变图像的画面
C.
“图像大小”命令可以在不损失像素的情况下缩小图像,而“画布大小”命令则不可以
D.
“图像大小”命令无法扩展画布,而“画布大小”命令可以
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【单选题】系统的幅频特性|H(ω)|和相频特性如图(a)(b)所示,则下列信号通过该系统时,不产生失真的是 ( )。
A.
f(t) = cos(t) + cos(8t)
B.
f(t) = sin(2t) + sin(4t)
C.
f(t) = sin(2t) sin(4t)
D.
f(t) = ［cos(4t)］^2
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【单选题】系统的幅频特性|H(ω)|和相频特性如图(a)(b)所示,则下列信号通过该系统时,不产生失真的是 ( )。
A.
f(t) = cos(t) + cos(8t)
B.
f(t) = sin(2t) + sin(4t)
C.
f(t) = sin(2t) sin(4t)
D.
f(t) = cos2(4t)
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A.
was raining
B.
would be raining
C.
had been raining
D.
rained
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A.
was raining
B.
rained
C.
had been raining
D.
have rained
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A.
was raining
B.
had been raining
C.
would be raining
D.
rained
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A.
was raining
B.
would be raining
C.
had been raining
D.
have rained
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