给出生成下列语言的上下文无关文法GL(G)={0na1nbmcm|n>0，m>=0} A: S→ABA→0A1|0a1B→bBc|ε B: S→ABA→01A|01aB→bBc|ε C: S→ABA→0A1|0a1B→bBc|bc D: S→ABA→0A1|a01B→bcB|ε

同一个MSC下，整个切换过程由（）共同完成 A: MS、BTS、BBC、MSC B: BTS、BBC、MSC C: BTS、BBC D: MS、BTS、BBC

In 1803 the United States purchased Louisiana from _____.

Which of the following about the BBC is NOT true? A: The BBC is run under a Royal Charter since its establishment. B: Today the BBC provides more radio broadcasting than television output. C: The BBC provides not only national broadcasting service but also world service. D: The BBC is a private corporation.

‌羊的齿式为‎ A: 2（0 0 3 0/ 4 0 3 0）=20 B: 2（0 0 3 3/ 4 0 3 3）=32 C: 2（4 0 3 0/ 4 0 3 0）=28 D: 2（4 0 3 3/ 4 0 3 3）=40

Which of the following about the BBC is NOT true? A: There is no advertising on any of the BBCprogrammes. B: The BBC is funded by license fees paidby people who possess television sets C: The BBC has four channels. D: The BBC provides the World Servicethroughout the world.

‍Which of the following four statements about British Broadcasting Corporation is false?‎ A: It is sometimes referred to as “Auntie” or “the Beeb”. B: The stated mission of the BBC is "to inform, educate and entertain". C: The motto of the BBC is "Nation Shall Speak Peace Unto Nation". D: BBC One and BBC Three are the two flagship channels of BBC television channels.

国际网球联合会成立于 A: 1903 B: 1803 C: 1913 D: 1923

霍尔效应哪一年发现的？ A: 1881 B: 1879 C: 1803 D: 1831

下列设置打开文件对话框OpenFileDialog1的Filter属性正确的是_________。 A: OpenFileDialog1.Filter=Pictures(*.Bmp)|*.Bmp B: OpenFileDialog1.Filter=["Pictures(*.Bmp)"|"*.Bmp"] C: OpenFileDialog1.Filter="Pictures(*.Bmp)|*.Bmp" D: OpenFileDialog1.Filter={Pictures(*.Bmp)|*.Bmp} E: OpenFileDialog1.Filter=(Pictures(*.Bmp)|*.Bmp)