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【多选题】
抽样推断的特点有
A.
以概率论为依据,以大数法则和中心极限定理为基础
B.
按随机原则抽取一部分单位进行调查
C.
抽样推断的误差可以计算并加以控制
D.
以部分单位的指标数值去推断总体的指标数值
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【单选题】有以下程序: Class Date {public: Date(int y,int m,int d); {year=y; month=m; day=d;} Date(int y=2000) {year=y; month=10; day=1;) Date(Date &D) {year=d.year; month=d.month; day=d.day;} void print() {cout<<yea...
A.
2
B.
3
C.
4
D.
5
【单选题】有以下程序: Class Date { public: Date(int y,int m,mt d); { year=y; month=m; day=d; } Date(int y=2000) { year=y; month=10; day=1; } Date(Date &D) { year=d.year; month=d.month; day=d.day; } Void prin
A.
2
B.
3
C.
4
D.
5
【单选题】有以下程序: class Date { public: Date(int y,int m,int D) ; { year =y; month=m; day=d; } Date(int y=2000) { year=y; month=10; day=1; } Date(Date &D) { year=d.year; month=d.month; day=d.day; } void print () ...
A.
2
B.
3
C.
4
D.
5
【简答题】用所给词的适当形式填空(5分): 小题1: I have been in No. 2 Middle School for two years. I don’t worry about _______________ (not have) new good friends. 小题2: The big birthday cake _____________________ (divide) into ...
【多选题】下面符合封装的概念的程序是()
A.
public class Date{private int year; public int getYear( ) {return year;} public void SetYear(int y) {year=y;}} ;
B.
protected class Date{private int year; public int getYear( ) {return year;} public void SetYear(int y) {year=y;}} ;
C.
public class Date {public int year; public int getYear( ) {return year;} public void SetYear(int y) {year=y;}} ;
D.
public class Date{private int year; private int getYear( ) {return year;} rivate void SetYear(int y) {year=y;}}
【简答题】用所给单词或词组的正确形式填空。 consist of,divide …into,leave out,take the place of,break away from, in memory of,have influence on,arrange for,refer to,available 1. The TV series from Korea _____a strong _____ chil...
【单选题】有以下程序: class Date { public: Date(int y,int m,int d) { year = y month = m day = d } Date(int y = 2000) { year = y month = 10 day = 1 } Date(Date &d) { year = d.year month = d.month day = d.day } void p...
A.
2
B.
3
C.
4
D.
5
【单选题】有以下程序: class Date { public: Date(int y, int m, int d); year = y; month = m; day = d; Date(int y = 2000) year = y; month = 10; day = 1; Date(Date &d) { year = d.year; month = d.month; day = a.day; } vo...
A.
2
B.
3
C.
4
D.
5
【单选题】可以计算当前日期所处年份的表达式是( )。
A.
Day(Date)
B.
Yea(Date)
C.
Year(Day(Date) )
D.
Day(Year(Date) )
【单选题】有以下程序: class Date { public: Date(int y,int m,int d) { year=y month=m day=d } Date(int y=2000) { year=y month=10 day=1 } Date(Date &d) { year=d.year month=d.month day=d.day } void print( ) { cout<<year...
A.
2
B.
3
C.
4
D.
5
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