A:I'm going to draw an egg tomorrow.
B:I am drawing an egg now·
C:I want to draw a picture for my brother.
下列有机物分子中属于手性分子的是( )
①乳酸CH3CH(OH)COOH②2丁醇 ③ ④丙三醇.
梳理“我”心理变化的过程,分别用一个词语概括。
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