42 下列何者不適用於貴金屬合金(noble metal alloys)之助熔劑(flux)?
(A)鐵丹(rouge)
(B)硼酸(boric acid)
(C)硼酐(boric anhydride)
(D)硼砂(borax)
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統計: A(155), B(24), C(41), D(24), E(0) #1155716
統計: A(155), B(24), C(41), D(24), E(0) #1155716