46. Which of the following is true about Bitcoin?
(A) Bitcoin addresses are known only to their owners.
(B) Once a transaction is made, the Bitcoin cannot be refunded.
(C) Bitcoin user’s identity is always open to the general public.
(D) When a payment is received, the Bitcoin can be turned into local currency.
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（A）第三段第一句：All Bitcoi...
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題目翻譯及解析： 以下哪一項是關於比特...
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