20. What object should be placed on the floor in front of emergency generator switchboard?
(A) Wooden board.
(B) Rubber mat.
(C) Carpet.
(D) Metallic step.

答案：登入後查看
統計： A(54), B(427), C(111), D(110), E(0) #1900570

詳解 (共 1 筆)

#3661484
應踩於絕緣墊上避免接地通常為橡膠材質
(共 20 字，隱藏中）
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