【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.
DeCr operator--(DeCr&,int);
C.
friend DeCr&operator--(DeCr&);
D.
friend DeCr operator--(DeCr&,int);
【单选题】不同种类的植物通过光周期诱导的天数不同,短的如苍耳、水稻、浮萍、油菜等只要 个合适光周期即可完成光周期诱导。
【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