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毎日1問、正解者には6つの富を報酬として、参加者には2つの富を報酬として支給;第507題

2016-05-01View Original

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単一選択問題:安全電圧の決定値は、使用環境や使用方法などの要因に基づいて決定される。アセチレン発生装置など、特に危険な環境で使用される携帯用照明器具に適用される安全電圧は、(  )Vです;水中での作業環境で使用するハンドライトの安全電圧は()Vです。  A.12,6   B.6,6   C.12,12   D.6,12  正解:A,

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