【单选题】【消耗次数：1】
原核微生物细胞核糖体大小为
①
30S
②
50S
③
70S
④
80S
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文法G【S】=（{b}，{S，B}，S，{S→b│bB，B→bS}），该文法所描述的语言____。
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