FANUC系统中,以下选项中哪个是非模态式G代码?()
A.G01
B.G03
C.G54
D.G20
参考答案:D
Attention, coffee lovers! We have for you, the best coffee machine ___ invented.
A.ever
B.already
C.even
D.nowadays
关系模式R(B,C,M,T,A,G),根据语义有如下函数依赖集:F={B→C,(M,T)→B,(M,C)→T,(M,A)→T,(M,B)→C。则R的规范化程度最高达到( )。
A.1NF
B.2NF
C.3NF
D.4NF