28. Which of the following elements is required for the stability of cell walls?
(A) Zinc.
(B) Chlorine.
(C) Calcium.
(D) Manganese.
(E) Sodium.
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統計: A(0), B(0), C(1), D(0), E(0) #3477533
統計: A(0), B(0), C(1), D(0), E(0) #3477533