填空题 适中0.65 引用1 组卷394
下图为示波器原理图,如果荧光屏的第二象限有亮斑,则_____ 接正极(X,X')____ 接正极(Y,Y');在电极YY'之间所加电压按b图所示规律变化,在电极XX'之间所加电压按c图所示规律变化,则荧光屏上看到的图形是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/74180d9c-eab1-4fd9-a8a0-93d8945d4fbc.png?resizew=745)
A.
B.
C.
D. ![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/6e88c018-f529-4516-91d2-0cdb54e57a9c.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/74180d9c-eab1-4fd9-a8a0-93d8945d4fbc.png?resizew=745)
A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/b28a5cbf-3df2-4df5-96f8-8f78090a79a1.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/d077bf4b-1808-4e5a-a87c-001db89cf05c.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/c523d35e-09bc-4754-b881-044fcf0ef197.png?resizew=82)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/6e88c018-f529-4516-91d2-0cdb54e57a9c.png?resizew=79)
19-20高二上·贵州铜仁·阶段练习
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