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问题 选择题
在下列各数
1
5
，
8
20
，
2
5
，
10
50
，0.2，0.4中，与
4
10
相等的数有（　　）
A．2个B．3个C．4个D．5个
答案

4
10
=0.4；

1
5
=0.2；

8
20
=0.4；

2
5
=0.4；

10
50
=0.2；

所以在数列中，与

4
10
相等的数有
8
20
、
2
5
、0.4共3个．

故选：B．

单项选择题

在图4-122所示三个振动系统中，物块的质量均为m，弹簧的刚性系数均为是，摩擦和弹簧的质量不计。设图4-122a、b、c的振动频率分别为f1、f2、f3，则有（）。

A.A

B.B

C.C

D.D
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单项选择题

(31) data effectively is crucial for success in today’s competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the (32) in hardware and software. (33) integration uses a base document that contains copies of other objects. (34) integration uses a base document that contains the current or most recent version of the source document it contains. (35) provides an overview of the program written in "plain" English, without the computer syntax.

A．similarity

B．interoperability

C．diversity

D．interaction
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