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上升时间 (rise time)t r
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设关系R与关系S具有相同的目，且相对应的属性的值取自同一个域，则R ? S可记作A．{t | t ?R ú t ?S}B．{t | t ?R ù t ?S}C．{t | t ?R ù t ?S}D．{t | t ?R ú t ?S}
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（ 34 ）设关系 R 与关系 S 具有相同的属性个数，且对应属性的值取自同一个域，则 R ? S 可记作A ） {t | t ∈ R ∨ t ∈ S}B ） {t | t ∈ R ∧ t ? S}C ） {t | t ∈ R ∧ t ∈ S}D ） {t | t ∈ R ∨ t ? S}
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In one project of software engineering, the issue that adding more people will not lead to corresponding rise of productivity.A．the time that we wait during the process of workingB．complexity of constructing prototype modelC．the number of stations that we needD．communication complexity among people
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设有关系R和S,与R－S等价的元组关系演算表达式是( )。
A.{t|R(t)∨┐s(t)}B.{t|R(t)∧┐S(t)}C.{t|(u)R(t∨┐S(u))D.{t|(u)R(t)∧┐S(u)}
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为使下列程序的正确输出结果为： Now is 2004-7-6 12:12:12 那么应该在程序划线处填入的语句是( )。 #include ＜iostream＞ using namespace std; class TIME; class DATE { public: DATE(int y=2004,int m=1,int d=1) { year=y; month=m; day=d; } void DateTime(TIME t); private: int year,month, day; }; class TIME { public: TIME(int h=0,int m=0,int s=0) { hour=h; minute=m; second=s; } ______________; //将类 DATE 中成员函数 DateTime 声明为类 TIME 的友元函数 private: int hour,minute, second; }; void DATE: :DateTime(TIME t) { cout＜＜"Now is "＜＜year＜＜'-'＜＜month＜＜'-'＜＜day＜＜ ' '＜＜t.hour＜＜":"＜＜t.minute＜＜': '＜＜t.seoond＜＜'.'＜＜end1; } int main ( ) { DATE d(2004,7,6); TIME t (12, 12, 12); d. DateTime (t); return 0; }A．friend void DateTime(TIME t);B．friend void DATE::DateTime(TIME 0;C．void DateTime(TIME t);D．friend void DateTime(TIME t);
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为了使程序的输出的正确结果为： Now is 2004．7.10 10：10：10． 那么应在下列程序划线处填入的正确语句是( )。 那么应在下列程序划线处填入的正确语句是( )。 #include ＜iostream＞ using namespace std; class TIME; class DATE { public: DATE(int y=2004,int m=1,int d=1) { year=y; month=m; day=d; } friend void DateTime(DATE d, TIME t); private: int year, month, day; }; class TIME { public: TIME(iht h=0, int m=0,int s=0) { hour=h; minute=m; second=s; } friend void DateTime(DATE d,TIME t); private: int hour,minute, second; }; ______________________ //函数 DateTime 的首部 { cout＜＜"Now is"＜＜d.year＜＜'.'＜＜d.month＜＜'.'＜＜d.day＜＜ ' '＜＜t.hour＜＜":"＜＜t.minute＜＜':'＜＜t.second＜＜'.'＜＜end1; } int main ( ) { DATE d(2004,7,10); TIME t(10, 10, 10); DateTime(d,t); return 0; }A．void DateTime(DATE d,TIME t)B．void TIME::DateTime(DATE d,TIME t) constC．friend void DateTime(DATE d,TIME t)D．void DATE::DateTime(DATE d,TIME t)
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To design a CMOS invertor with balance rise and fall time,please define the ration of channel width of PMOS and NMOS and explain?
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Which of the following would be the best title for text? （ ）A.Rising Cost, A Pain in the Neck
B.The Irreversible Wage inflation
C.To Rethink Global Production Plans
D.As Wages Rise, Time to Leave China
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TCP/IP与门禁控制器相接，正确方法是（）A、T+接T+T-接T－R+接R+R－接R－B、T+接R+T-接R－R+接T+R－接T－C、T+接T-T-接T+R+接R-R－接R+D、T+接R-T-接R+R+接T-R－接T+
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单选题Why does the author refer to Coolidge’s maxim as silly?A
More and more people are applying for unemployment insurance.B
Unemployment rate is not likely to rise quickly nowadays.C
Losing jobs doesn’t necessarily lead to unemployment.D
Today’s labor market is much too complicated than Coolidge’s time.
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单选题In context, which of the following revisions of the underlined portion of sentence 12(reproduced below) is most effective at making it clearer and more specific?Unfortunately, many students today don’t have time for that.A
today have hardly even 1 hour for such thingsB
today, unlike those in Archimedes’ time, don’t have time to go to the moviesC
today don’t have time for such excursionsD
of modern times lack sufficient time for the kinds of things explained aboveE
today lack sufficient time for things like this
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单选题TCP/IP与门禁控制器相接，正确方法是（）A
T+接T+T-接T－R+接R+R－接R－B
T+接R+T-接R－R+接T+R－接T－C
T+接T-T-接T+R+接R-R－接R+D
T+接R-T-接R+R+接T-R－接T+
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单选题Stand of the tide is that time when（）.A
the vertical rise or fall of the tide has stoppedB
slack water occursC
tidal current is at a maximumD
the actual depth of the water equals the charted depth
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单选题Why can’t we use time carelessly?A
Because time is too expensiveB
Because time will get backC
Because we are too poorD
Because time never returns
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单选题对可修复性产品，在任一时刻t的瞬时有效度A（t）与可靠度 R（t）的关系为（）。A
A（t）≧R（t）B
A（t）＝R（t）C
A（t）＜R（t）D
A（t）≦R（t）
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