3:文法 G[N]= ( {b} , {N , B} , N , {N→b│bB , B→bN} ),该文法所描述的语言是
A:L(G[N])={bi│i≥0}
B: L(G[N])={b2i│i≥0}
C: L(G[N])={b2i+1│i≥0}
D: L(G[N])={b2i+1│i≥1}
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