圓木施工架之立柱最大間隔為多少m?
(A)1
(B)1.5
(C)2
(D)2.5
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統計: A(0), B(0), C(1), D(0), E(0) #283153
統計: A(0), B(0), C(1), D(0), E(0) #283153