阿摩線上測驗
49. The vascular system of a three-year-old dicot stem consists of
(A) 3 rings of xylem and 3 of phloem.
(B) 2 rings of xylem and 2 of phloem.
(C) 3 rings of xylem and 1 of phloem.
(D) 1 rings of xylem and 3 of phloem.
(E) 2 rings of xylem and 3 of phloem.
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統計： A(11), B(2), C(24), D(3), E(0) #2241888
統計： A(11), B(2), C(24), D(3), E(0) #2241888
