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[判断题]
B2C(也有写成 BTC,是Business-to-Customer的缩写)“商对客”是电子商务的一种模式,也就是通常说的直接面向消费者销售产品和服务商业零售模式。()
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A public “scribe” (Para. 2, Line 1) is ________.
A) a secretary who does your business or social writing
B) a machine that does writing for you
C) a public school where writing is taught
D) a person who ears a living by writing for others
给出语言L(G)={aibjcj|i≥1,j≥0),其相应的文法G为_______。
A.S→aSc|B B→bB|b
B.S→aS|T T→bTc|bc
C.S→Abc|A A→aA|a
D.S→AB|A A→aA|a B→bBc|bc
设有文法G,满足L(G)=={aibj cjdi|i≥0且j≥1}的文法G为_______。
A.S→aSd|T T→bcT|bc
B.S→aSd|T T→bTc|bc
C.S→AB|B A→aAd|ad B→bBc|bc
D.S→Abc|A A→aAd|ad
A.S→aS|T T→bcT|bc
B.S→aS|T T→bTc|bc
C.S→AB|B A→aA|a B→bBc|bc
D.S→Abc|A A→aA|a