42. 下列製圖鉛筆中,何者筆芯硬度最硬
(A)2B
(B)F
(C)H
(D)HB。
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統計: A(2), B(3), C(22), D(4), E(0) #2299041
統計: A(2), B(3), C(22), D(4), E(0) #2299041