13.石墨鉛筆筆芯由軟至硬,下列排列何者正確?
(A)B→HB→F→H
(B)B→HB→H→F
(C)B→F→HB→H
(D)B→H→F→HB
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統計: A(1), B(0), C(0), D(0), E(0) #3885028
統計: A(1), B(0), C(0), D(0), E(0) #3885028