___ 7. Glass has a hardness of 5.5. According to the table, which could glass scratch? 
(A)topaz
(C)feldspar (
(B)apatite
(D)diamond

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統計： A(3), B(39), C(16), D(10), E(0) #1342048

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#2431490
玻璃硬度5.5可以刮傷比5.5小的物質，...
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