9.工作用階梯應寬於56公分，梯級面深15公分以上，且斜度應在多少度以內並有扶手? (A)30(B)35(C)60(D)75。

問題詳情

9.工作用階梯應寬於56公分，梯級面深15公分以上，且斜度應在多少度以內並有扶手?
(A)30
(B)35
(C)60
(D)75。

參考答案

答案：C
難度：適中0.488095
統計：A(13),B(8),C(41),D(16),E(0)

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