問題詳情
31.依法令規定，缺氧危險作業場所係指空氣中氧氣濃度未達多少％之場所？
(A)14
(B)16
(C)18
(D) 20。
(A)14
(B)16
(C)18
(D) 20。
參考答案
答案：C
難度：簡單0.790698
統計：A(2),B(4),C(34),D(2),E(0)
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