38.樹木產生木材與樹皮所造成的周徑增加是由於
(A)初級生長(primary growth)
(B)次級生長(secondary growth)
(C)頂端分生組織生長(apical meristem growth)
(D)不定生長(indeterminate growth)
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統計: A(2), B(58), C(1), D(0), E(0) #3848110
統計: A(2), B(58), C(1), D(0), E(0) #3848110