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【简答题】
已知如下 FOR i:= n DOWNTO 1 DO {语句1} BEGIN x:=x+1; {语句2} FOR j:=n DOWNTO i DO {语句3} y:=y+1; {语句4} END; 语句1执行的频度为_______ ;语句2执行的频度为 _______ ;语句3执行的频度为 _______;语句4执行的频度为_______。(精确表示)
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举一反三
【单选题】—You were out when I dropped in at your house. —Oh, I ________ for a friend from England at the airport.
A.
was waiting
B.
had waited
C.
am waiting
D.
has waited
【简答题】已知某疏浚工程所包含的作业工时(天)，成本(万元)等的情况如表1所示。 问题 1．画出该工程正常情况下的网络图。 2．确定关键线路、总工期和总成本。 3．试确定把整个工程的工期减少7天，并使总成本增加最少的最佳方案。求出该方案所对应的总成本。
【单选题】—You were out when I dropped in at your house.
A.
h, I ________ for a friend from England at the airport.
B.
was waiting
C.
had waited
D.
am waiting
E.
has waited
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