如图由构成的运算电路, R F =2 k Ω, R 3 = R 1 ∥ R 2 ∥ R F 。为使 U 0 =-2 U i1 - U i2 时,则 R 1 及 R 2 各为______ k Ω。
A.
.1,2
B.
.2,1
C.
.2,4
D.
.4,2
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