15. 鋅精礦適運溼度為多少?
(A)7~12%
(B)13~16%
(C)17~20%
(D)20~25%
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統計: A(1), B(0), C(0), D(0), E(0) #3934211
統計: A(1), B(0), C(0), D(0), E(0) #3934211