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符合1987VHDL标准的标识符是
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符合1987VHDL标准的标识符是
A、2A
B、A+2
C、A_2
D、22
时间：2021-07-17 23:25
关键词：
机械制造与自动化
高起专
PLC原理
2019级第三学期期末考试
答案解析
C
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