题目：
蓄电池负极桩用“-”符号表示，其周围（）。
A、不涂色
B、涂黄色
C、涂绿色
D、涂红色
答案：
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参考答案：B
蓄电池负极桩用“-”符号表示，其周围（）。A、不涂色B、涂黄色C、涂绿色D、涂红色
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