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当前学科:配电运行维护初级作业员
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变压器台架应安装“禁止攀登,高压危险”警告标志牌,尺寸统一为()。安装在变压器托担上,位于变压器()左侧。
A . 300*230mm
B . 300*240mm
C . 320*260mm
D . 正面
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