下图为嫁接过程示意图,结构A的名称是               ,在嫁

下图为嫁接过程示意图,结构A的名称是               ,在嫁接时要用麻绳或塑料条捆紧扎好,目的是使接穗与砧木的               紧密结合。

答案

接穗;形成层;

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