能够产生语言[img=527x63]1803448d4175907.png[/img]的文法是 A: 文法G(S): S → AC A → aAb | ab C → cC | c B: 文法G(S): S → AC A → aAb | ab C → cC | ε C: 文法G(S): S → AC | A A → aAb | ab C → cC | c D: 文法G(S): S → AC A → aAb | ε C → cC | ε

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Bitterness ______ the man who had made the world laugh. () A: fed on B: fed with C: fed up D: fed<br/>for

脂溶性维生素是：A维生素AB维生素CC维生素ED维生素B

Have you fed the dog yet?TO____________ fed yet?

中国大学MOOC: 对下面文法，他的产生语言是G = ({S, A, B, C}, { a, b, c}, P, S)其中P:{S→aBC | aSBC，CB→BC ，aB→ab，bB→bb，bC→bc，cC→cc}

Don’t feed the fish again. I ____ them just now. A: have fed B: fed C: was feed D: has fed

In 1803 the United States purchased Louisiana from _____.

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9 、若 A ＝ B ，则 AB ＝ A 。 A 对 B 错