组合电器:运行中SF6气体年漏气率(____)。≤0.3%/年$;$≤0.4%/

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问题 组合电器:运行中SF6气体年漏气率(____)。≤0.3%/年$;$≤0.4%/年$;$≤0.5%/年$;$≤0.6%/年

选项 ≤0.3%/年$;$≤0.4%/年$;$≤0.5%/年$;$≤0.6%/年

答案 C

解析
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