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问题 单项选择题

多元线性回归方程假设检验，无效假设是（）。

A.β=β=…β

B.β=β=…β≠0

C.β=β=…β=0

D.β=β=…β=β

E.D.β、β、…、β不全为零

答案

参考答案：C

完形填空

基础训练篇（12）

We all know that computers have played and (1)__________ play a very important part (2)___________ various fields.

In personal lives, computers can do lots of work. It can carry (3)___________ people’s instructions.  In agriculture, computers are used (4)_____________ control the (5)__________(grow) conditions of vegetables and other plants. In transportation(交通运输), computers can work out the best distance (6)__________ trains and operate the trains instead (7)____________ human beings. In the fields of education, health and scientific research, computers are important, (8)___________. People use them to store information (9)______________ records.

Because of the computers, life is easier and (10)________ convenient for people.
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单项选择题

公式：(直接工程费+措施费+间接费)×相应的利润率计算的是( )。

A．税金

B．利润

C．规费

D．措施费
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