A and M
=Agricultural and Mechanical 《农业与机械》(期刊)

A
abbr.
安 (ampere)
As 或 A's and
[连接并列的名词、代词或数词]同, 和, 与, 如： Father and I went to Xinhua bookstore yesterday. 父亲和我昨天到新华书店去过。 M
n.
字母M