假定类TEST中重载运算符＜＜，则运算符＜＜在类TEST中正确的声明形式为（ ） A: ostream& operator＜＜(ostream& output, const TEST& obj); B: friend ostream& operator＜＜(ostream& output, const TEST& obj); C: ostream& operator＜＜(const TEST& obj); D: friend ostream& operator＜＜(const TEST& obj);

运算符重载测验: 为类ABC定义重载运算符“+”，下列哪种定义形式是正确的？（） A: 定义为类ABC的函数成员： void operator +( ){......} B: 定义为类ABC的函数成员： ABC operator +( ABC obj ){......} C: 定义为类ABC的函数成员： ABC operator +( ABC obj1, ABC obj2 ){......} D: 定义为类ABC的友元函数： ABC operator +( ABC obj ){......}

1、In MATLAB, the right division operator (/) and the left division operator (\) are equivalent.

1、In MATLAB, the right division operator (/) and the left division operator () are equivalent. A: 正确 B: 错误

Set X_i=(x_i (1),x_i (2),⋯,x_i (n)) as the behavior sequence of factor X_i, D_1 as the sequence operator, and X_i D_1=(x_i (1)d_1,x_i (2)d_1,⋯,x_i (n)d_1), where x_i (k)d_1=x_i (k)/x_i (1); x_i (1)≠0, k=1,2,⋯,n, then D_1 is A: A. Initial valued operator B: B. Averaging operator C: C. Interval valued operator D: D. Invert operator

如下代码在控制台打印结果为： var obj = {1 : 1}; var arr = [1,1]; console.log(obj + arr); A: 1 B: 2 C: [object Object]1,1 D: 1,1[object Object]

Operator: ( ) A: An operator is a DNA region that is working with promoter for genes to express. B: An operator is a DNA region at 5’ of a gene for a repressor to bind to prevent gene expression. C: An operator is a repressor protein to help genes to express. D: An operator is a repressor protein to inhibit genes to express.

The conditional operator (?:) ________. A: is the only ternary operator in C B: is a unary operator C: associates from left to right D: accepts two operands

The OR (||) operator _________.

以下装箱、拆箱语句中，错误的有（） A:  object obj=100；  int m=（int）obj； B:  object obj=100；  int m=obj； C:  object obj=（int）100；  int m=（int）obj； D:  object obj=（object）100；  int m=（int）obj；