問題詳情
27. Trace elements are those required by organisms in only minute quantities. Which of the following is a trace element that isrequired by humans and other vertebrates?
(A) nitrogen
(B) calcium
(C) iodine
(D) sodium
(E) phosphorus
(A) nitrogen
(B) calcium
(C) iodine
(D) sodium
(E) phosphorus
參考答案
答案：C
難度：適中0.473684
統計：A(0),B(6),C(9),D(1),E(0)
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