78.貨幣基數(monetary base)減掉流通中的通貨(currency in circulation)，等於：
(A)準備金(reserves)
(B)借入的貨幣基數(borrowed base)
(C)非借入的貨幣基數(unborrowed base)
(D)貼現放款(discount loan)

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統計： A(51), B(4), C(0), D(2), E(0) #1727254