阿摩線上測驗
23. What ions are very important for the proper functioning of biologic systems, such as nerves and muscles?
(A) alkali metal ions
(B) nitrogen ions
(C) oxygen ions
(D) sulfur ions
(E) alkaline earth metal ions
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統計： A(2), B(0), C(0), D(0), E(2) #3278698
統計： A(2), B(0), C(0), D(0), E(2) #3278698
