图示叶芽的结构,下列关于叶芽的叙述中正确的是( )
A:①发育成侧芽
B:②发育成枝条
C:③发育成茎
D:④发育成叶
一个角的余角比它的补角的13还少20°,求这个角的度数.
— That's for sure. Trust me!
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