【单选题】设有类Decr,将前缀 运算符 “ - - ”重载为友元函数,下列原型中能正确用于类中说明的是()
A.
Decr operator - -(int) ;
B.
Decr operator - - (Decr,int) ;
C.
friend Decr operator- - (Decr) ;
D.
friend Decr operator - -(Decr,int) ;
【单选题】Which of the following situation will not bring price up?
B.
The decrease of the money's value
C.
The increase of demand for goods
D.
The input of more money to the market
【单选题】将前缀运算符“--”重载为非成员函数,下列原型中,能正确用于类中说明的是( )。
B.
Decroperator--(Decr&,int);
C.
friend Decr& cperator--(Decr&);
D.
friend Decr operacor--(Decr&,int);
【单选题】( 14 )将前缀运算符 “ -- ” 重载为非成员函数,下列原型中,能正确用于类中说明的是
A.
) Decr& operator --(int)
B.
) Decr operator --( Decr&,int)
C.
) friend Decr& operator --(Decr&)
D.
) frlend Decr operator --(Decr&,int)
【判断题】从细胞中提取基因组DNA时,添加溶菌酶和EDTA的作用是去除细胞膜。
【单选题】Developing an efficient system for transporting products __________.
A.
becomes easy once the best mode of transportation is selected
B.
is almost always the responsibility of marketing intermediaries
C.
can be a complex process that involves several interrelated decisions
D.
used to be amjor concern for most firms, but has become much simpler in recent years as production technologies have stabilized
【单选题】在Excel中,行号与列号要设置为绝对地址时,其行号或列号前要加上( )。
【单选题】产品的品牌、包装属于产品整体概念中的()层次。