Let @ represent one of the four basic arithmetic operations

题目
单选题
Let @ represent one of the four basic arithmetic operations such that, for any nonzero real numbers P and Q, P @ 0=P and P @ Q=Q @ P. Which arithmetic operation(S) does the symbol @ represent?
A

×only

B

+only

C

-only

D

-and×

E

+and÷

参考答案和解析
正确答案: D
解析:
If P @ Q=P, then symbol @ can represent either addition or subtraction, but not multiplication or division. Since it is also given that P @ Q=Q @ P, the operation @ is commutative. Since addition is commutative and subtraction is not commutative, the symbol @ represents only addition.
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相似问题和答案

第1题:

Calculator is(66) for performing arithmetic operations, but that requires human intervention to alter its stored program, if any, and to initiate each operation or sequence of operations. A calculator performs some of the functions of a computer, but usually operates only with frequent human intervention.Microcomputer's processing unit consists of one or more microprocessors, and includes storage and input-output(67). Personal computer primarily intended for(68) use by an individual.(69) computer can be hand-carried for use in more than one location. Minicomputer is functionally intermediate between a microcomputer and a mainframe. And supercomputer has the highest processing speeds available at a given time for(70) scientific and engineering problems.

A.suitable

B.well-formed

C.applicable

D.usable


正确答案:A

第2题:

下列语句能给数组赋值,而不使用for循环的是

A.myArray{[1]="One";[2]="Two";[3]="Three";}

B.String s[5]=new String[] {"Zero","One","Two","Three","Four"};

C.String s[]=new String[] {"Zero","One","Two","Three","Four"};

D.String s[]=new String[]= {"Zero","One","Two","Three","Four"};


正确答案:C
解析:字符串数组赋初值的方法有两种,一种是如选项C一样初始化。另外一种是先为每个数组元素分配引用空间,再为每个数组元素分配空间并赋初值。例如还可做如下赋值:
  string s[]=new String[5];
  s[0]="Zero";
  s[1]="One";
  s[2]="Two";
  s[3]="Three";
  s[4]="Four";

第3题:

Let’s have a run through. This sentence means let’s run from one side to another. ()

此题为判断题(对,错)。


参考答案:×

第4题:

Let’s have a run through.This sentence means let’s run from one side to another.

A

B



第5题:

Starting from 22, ________.

[A] one will obtain more basic rights

[B] the older one becomes, the more basic rights he will have

[C] one won’t get more basic rights than when he is 21

[D] one will enjoy more rights granted by society


正确答案:C
44. [C] 意为:个人的基本权利将不会比 21 岁时有所增加。
文中倒数第二句说明,一旦达到成人阶段(21岁),将不再继续获得其他额外的基本权利。所以,本题的正确选项应为[C]。其他项[A] 个人会得到更多的基本权利;[B] 一个人越老,拥有的基本权利越多;[D] 人们将享有社会赋予的更多的权利;与原文内容相反。

第6题:

下列语句能给数组赋值而不使用for循环的是

A.myArray{[1]="One";[2]="Two";[3]="Three";}

B.String s[5]=new String[]{"Zero", "One", "Two", "There", "Four"};

C.String s[]=new String[]{"Zero", "One", "Two", "There", "Four"};

D.String s[]=new String[]=|"Zero", "One", "Two", "There", "Four"};


正确答案:C
解析:A)、D)语法不正确,B)中s[5]的形式只能通过for循环的格式进行赋值,而不能直接赋值。C)中表达式左侧的“[]”说明现在定义一个数组,不需要指明数组长度,而表达式右侧“[]”在后面直接紧跟初始内容时也是不需要指定数组大小的,数组大小直接由初值长度决定。

第7题:

12.

A. grade one,class four

B. class four,grade one

C. Grade One,Class Four

D. Class Four,Grade One


正确答案:D
12.D【解析】英语中表示单位或地址的名词的排列顺序通常是由小及大。同时要注意首字母要大写。

第8题:

There isn't enough room for us, _______ six dogs and one cat.

A、not to say

B、 not tomention

C、let it go

D、let alone


参考答案:D

第9题:

This bridge is ______ that one.

A. four times as long of

B. as four times as

C. four times as long as

D. long four times of


正确答案:C
答案为C。这座桥是那座的四倍长。比较的顺序是倍数+as+形容词/副词+as。

第10题:

When monitoring a system using /usr/bin/vmstat with an interval, the metrics under page pi and page po represent which of the following phrases?()

  • A、 The pages to and from paging space per second
  • B、 The page intervals and page operations per second
  • C、 The page interrupts and page operations per second
  • D、 The page segments transferred between pi and po devices per second

正确答案:A

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