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关于褐化下列说法正确的是()A.
一般木本植物的酚类化合物较草本高，组培时木本植物更易褐化。
B.
外的老化程度越高，其木质素的含量也越高，也越易褐化
C.
材料一般比幼龄材料褐化严重
D.
切口越大，酚类物质的被氧化面积也越大，褐化程度就会越严重
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