問題詳情

38.根據美國牙醫學會（ADA）分類，關於高貴合金（high noble alloy）中，化學成分重量百分比（weight %）的規定何者正確？
(A)金≧40%且貴金屬元素總和≧60%
(B)金≧40%且貴金屬元素總和≧50%
(C)金≧20%且貴金屬元素總和≧60%
(D)貴金屬元素總和≧50%

參考答案

答案：A
難度：非常簡單0.846
書單：沒有書單，新增

用户評論

【用戶】一定要一次過 一定可以過

【年級】國三下

【評論內容】High noble alloys (Precious metal)This group has a composition that is over 60% noble metal, of which more than 40% must be gold. The elements gold, palladium, platinum, rhodium, ruthenium, iridium and osmium are categorized as noble metals.

【用戶】一定要一次過 一定可以過

【年級】國三下

【評論內容】High noble alloys (Precious metal)This group has a composition that is over 60% noble metal, of which more than 40% must be gold. The elements gold, palladium, platinum, rhodium, ruthenium, iridium and osmium are categorized as noble metals.