A.1.2,1.2
B.1.21.2
C.x=1.2,y=1.2
D.x=1.2y=1.2
A.void f(int&) const;
B.const A * f(const int );
C.A& f(int, int=50);
D.A f(const int&) const;
A. Object o=new Button(" A" );
B. Button b=new 0bject(" B" );
C. Panel p=newFrame() ;
D. Fram
E. f=new Pane10;
A.ALTERTABLEtable_nameENABLEconstraint_name;
B.ALTERTABLEtable_nameSTATUS=ENABLECONSTRAINTconstraint_name;
C.ALTERTABLEtable_nameSTATUS=ENABLECONSTRAINTconstraint_name;
D.ALTERTABLEtable_nameENABLECONSTRAINTconstraint_name;
E.ALTERTABLEtable_nameTURNONCONSTRAINTconstraint_name;
F.ALTERTABLEtable_nameTURNONCONSTRAINTconstraint_name;
A.30.5
B.3.5
C.332.5
D.8.5
A.y是一个字符数组
B.y数组的元素个数为7
C.表达式y[3]='/n'合法
D.语句序列intk=6y[k]-=32不合法
设有两个基本表R(A,B,C)和S(D,E,F),试用SQL查询语句表达下列关系代数表达式:
(1)πA(R)
(2)σB='17'(R)
(3)R×S
(4)πA,F(σC=D(R×S)
A.cd/0e
B.'c''d'
C.cd
D.cd e