单选题How many positive 3-digit integers contain only odd digits?A 15B 75C 125D 225E 500

题目

单选题

How many positive 3-digit integers contain only odd digits?

125

225

500

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相似问题和答案

第1题：

How many broadcast domains are shown in the graphic assuming only the default vlan is configured on the switches?()

A. one

B. six

C. twelve

D. two

参考答案：A

第2题：

For a lightweight access point to participate in aggressive load balancing，it must have heard the client for how many seconds？（）

A、15
B、10
C、1
D、5

正确答案:B

第3题：

30． How many coins did Jim dig out from the garden?

A．Five．

B．Many coins．

C． No coin at all．

D．Only one．

正确答案：D
30.D【解析】由短文可知只有一枚硬币。

第4题：

单选题

Let Ω p be defined as p2/3-p for all positive integers, p. If Ωn = s, and s is a positive integer, which of the following is a possible value for s?

正确答案： A

解析：
根据题干Ωn =n²/3-n=s. n为正整数，且s为正整数；根据函数可知只有当n是3的倍数时，s才能为整数，否则如果n²/3不是整数，s也不是整数。现在可以从符合条件的n的最小值3代入到函数中。当n=3时，n²/3-n =3²/3-3 = 3-3 = 0 = s；当n=6时，n²/3-n = 6²/3-6 = 12-6 = 6 = s。所以故选D。

第5题：

You are designing the physical database layout on your host machine. What is the relationship between tablespaces and datafiles in the Oracle database?（）

A、One tablespace has only one datafile
B、Many tablespaces can share one datafile
C、One tablespace can have many datafiles
D、One datafile can contain many tablespaces

正确答案:C

第6题：

At least how many tests were carried out by the scientists referred to in this passage

A.Three
B.Two
C.Only one
D.No one knows

答案：A

解析：

第7题：

In order for a controller-based access point to be allowed to participate in aggressive loadbalancing，it must have heard the client within how many seconds？（）

A、15
B、10
C、1
D、5

正确答案:D

第8题：

How many positive roots does the equation (x+1/2)2012-x2012+2x+1/2=0 have? ____.

参考答案0

第9题：

单选题

If a and b are integers and the sum of ab and b is even, which of the following could be true?Ⅰ. a and b are both odd.Ⅱ. a is even and b is odd.Ⅲ. a is odd and b is even.

Ⅰ only

Ⅱonly

Ⅲ only

Ⅰ and Ⅱ

Ⅰand Ⅲ

正确答案： C

解析：
Plug-in. StatementⅠ：if a and b are both odd, says a=1 and b=3, then ab+b=6. Since the sum is even, statementⅠ is true. StatementⅡ：1et a=2 and b=3, then ab+b=9. Since the sum is odd, this statement is false. Statement Ⅲ：let a=3 and b=2, then ab+b=8, which is even. So both statement Ⅰand statementⅢ are true.

第10题：

单选题

How many positive integers less than 70 are equal to the product of a positive multiple of 5 and an even number?

正确答案： E

解析：
All even multiples of 5 must be multiples of 10. So the multiples of 10 between 0 and 70 are 10, 20, 30, 40, 50 and 60. That’s 6 altogether.

单选题How many positive 3-digit integers contain only odd digits?A 15B 75C 125D 225E 500

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