阿摩線上測驗
3. Indium has atomic number 49 and atomic mass 114.8 g. Naturally occurring indium contains a mixture of indium-112 and indium-115 in an atomic ratio of approximately
(A) 25/75. ;
(B) 6/94. ;
(C) 50/50. ;
(D) 94/6. ;
(E) 75/25.
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統計： A(0), B(1), C(0), D(0), E(0) #3507455
統計： A(0), B(1), C(0), D(0), E(0) #3507455
