40. A compound of which transition metal is responsible for the white color of most paper?
(A) titanium
(B) copper
(C) chromium
(D) nickel
(E) zinc

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統計: A(0), B(0), C(0), D(1), E(0) #3371125

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題目解析 這道題目詢問的是哪種過渡金屬...
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