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【单选题】
在原理图环境下,如果要以光标所在位置为中心,快速放大该部分区域,最快捷的操作是:A.
按键盘上“↑”键
B.
按键盘上“↓”键
C.
按键盘上“PageUp”键
D.
按键盘上“PageDown”键
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A.
MouseListener listener = new MouseListener() {……}
B.
ActionListener listener = new ActionListener() {……}
C.
Listener listener = new Listener() {……}
D.
Listener listener = new Listener() {……}
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