如图是茎的横切和纵切示意图据图回答下列问题1标号1为 作用是 .2标号2为 能够进行 形成新的木质部和韧皮部.3标号3的 Template




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tomski如图是茎的横切和纵切示意图据图回答下列问题1标号1为 作用是 .2标号2为 coloring