运行中组合电器SF6气体年漏气率应≤()0.5%/年$; $0.3%/年$

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问题 运行中组合电器SF6气体年漏气率应≤()0.5%/年$;    $0.3%/年$;    $0.4%/年$;    $0.2%/年

选项 0.5%/年$;    $0.3%/年$;    $0.4%/年$;    $0.2%/年

答案 A

解析
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