单项选择题

()外部中断 0 允许中断的 C51语句为 ______。 A.
RI=1 B.
TR0=1 C.
IT0=1 D.
EX0=1

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听力原文:W: Good morning, can I help yon?M: Yes, I'm looking for a Christmas present for my girl frienD.W: So you'd like to choose a dress here?M: But I don't know what's in now?W: How about this white dress? It's a new arrival.M: That's nicE.How much does it cost?W: $250.M: Mmm, I think that's a little expensivE.W: How about the red one? It's 20% off, now just $80.M: Great, I think I'll take this onE.(8)A.In a book storE.B.In a hotel.C.In a grocery.D.In a department storE.
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F.
(8)
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单项选择题
解决一对多配送的最短路线问题时通常可采用( )方法。
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