A methyl group is a basic unitin organic chemistry: one carbon atom attached to three hydrogen atoms.
甲基是有机化学的基本单位:一个碳原子连接三个氢原子。
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DNA and RNA are made of nucleotides. Each unit is a three-part molecule with a phosphate at one end, a sugar in the middle and a variable nucleobase at the other end.
Siemens AG is combining its three global carrier divisions into oneunitin an attempt to reduce costs in administration, sales and research and development.