It takes forty minutes to get from the airport to the city center by taxi.
It takes forty minutes to get from the airport to the city center by taxi.
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关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)→ZIP， ZIP→CITY}，关系模式CSZ的主属性是A．ZIPB．CITY,ST,ZIPC．CITY,ZIPD．ST,ZIP
有如下程序： #includeiostream usingnamespacestd； classPoint{ intX，Y； public point(intx1=0，inty1=O)tx(x1)，y(y1){} intget（）{returnx＋y；} }； classCircle{ pointcenter； intradius； public circle(intCX，intcy，intr)：center(cx，cy)，radius(r) {} intget（）{returncenter．get（）＋radius；) }; intmain（）{ circlec(3，4，5)； coutc．get（）endl； return0； } 运行时的输出结果是（ ）。A.5B.7C.9D.12
有如下程序：#includeiostreamusingnamespacestd；classPoint{intX，y；public：Point(intx1=0，inty1=0)：X(x1)，y(y1){}intget（）{returnx＋y；}}；classCircle{Pointcenter；intradius；public：Circle(intCX，intcy，intr)：center(CX，cy)，radius(r){}intget（）{returncenter．get（）＋radius；}}；intmain（）{Circlec(3，4，5)；coutc．get（）endl；return0；}运行时的输出结果是（ ）。A.5B.7C.9D.12
使用VC6打开考生文件夹下的工程test15_3。此工程包含一个test15_3.cpp，其中定义了类Time和Timex，Timex公有继承Time，但定义并不完整。请按要求完成下列操作，将程序补充完整。(1)完成类Time构造函数的定义，将数据成员hours和minutes分别初始化为参数new_hours和new_minutes的值。请在注释“//**1**”之后添加适当的语句。(2)完成类Timex的构造函数的定义，注意参数的传递。请在注释“//**2**”之后添加适当的语句。(3)请按时间格式“hour：minute”和“hour：minute：second”分别输出对象time1和time2所表示的时间，注意必须使用已经定义的成员函数。请在注释“//**3**”之后添加适当的语句。输出结果如下：20：3010：45：34注意：除在指定的位置添加语句外，请不要改动程序中的其他语句。源程序文件test15_3.cpp清单如下：include＜iostream.h＞class Time{public：Time(int new hours，int new_minutes){// ** 1 **}int get_hours()；int get_minutes()；protected：int hours，minutes；}；int Time：：get_hours(){return hours；}int Time：：get_minutes(){return minutes；}class Timex：public Time{public：Timex(int new hours，int new_minutes，int new_seconds)；int get_seconds()；protected：int seconds；}；// ** 2 **{seconds=new_seconds；}int Timex：：get_seconds(){return seconds；}void main(){Time time1(20，30)；Timex time2(10，45，34)；// ** 3 **}
关系模式CSZ(CITY，ST，ZIP)其属性组上的函数依赖集为F={(CITY，ST)+ZIP， ZIP→CITY}，关系模式CSZ的主属性是A．ZIPB．CITY，ST，ZIPC．CITY，ZIPD．ST，ZIP
关系模式CSZ(CITY，ST，ZIP)其属性组上的函数依赖集为F＝{(CITY，ST)→ZIP， P→CITY}，关系模式CSZ的主属性是A．ZIPB．CITY，ST，ZIPC．CITY，ZIPD．ST，ZIP
关系模式CSZ(CITY,ST,ZIP）其属性组上的函数依赖集为F={(CITY,ST）→ZIP,ZIP→CITY},关系模式CSZ的主属性是A．ZIPB．CITY,ST,ZIPC．CITY,ZIPD．ST,ZIP
Cats are creatures of habit.They like to go to sleep about the same time every day and for a certain length of time.They seem to have a natural clock inside them that tells them when to sleep.Cats increase their regular sleep with occasional cat naps（打盹）.Some experts feel that humans could also benefit from this habit.Cat naps help to build up energy in the body.They are also a good way to get rid of trouble!Since cats have the same moods（情绪）as humans,some experts behave that people can improve their moods.People might become happier.A number of famous people have copied cats by taking cat naps during the day.The naps would usually last from 15 to 30 minutes.Winston Churchill took cat naps.So did Presidents Harry Truman,John F.Kennedy and Lyndon B.Johnson.These famous men were known for their energy.They were also able to work long hours,often into the night.Napping was their secret.Perhaps more people learn from cats and take naps to feel better and live longer!Naps usually last__________.A.three hoursB.less than half an hourC.forty-five minutesD.fifty-five minutes