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当前学科:中级维修电工
题目:
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用普通示波器观测一波形,如荧光屏显示由左向右不断移动的不稳定波形时,应当调整()旋纽。
A . A、X位移
B . B、扫描范围
C . C、整步增幅
D . D、同步选择
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