19.10 mR等於多少C/kg in air?
(A)2.58×10-2
(B)2.58×10-4
(C)2.58×10-6
(D)2.58×10-8
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統計: A(87), B(110), C(1290), D(49), E(0) #1041427
統計: A(87), B(110), C(1290), D(49), E(0) #1041427