已知函数f(x)=x3+ax+b的图象是曲线C，直线y=kx+1与曲线C相切于点(1

（）复绕就是曳引比2：1的绕绳法。

一、数学推理

4， 13， 22， 31， 45， 54，( )， ( )

A．60 68

B．61 70

C．55 61

D．72 80

自然观察法不包括以下哪种方法？（）

A.问卷法

B.记录法对照

C.核查法

D.评定法

轧机主传动电机力矩的四个组成部分为：（）附加摩擦力矩、空转力矩、动力矩。

Man: I ran into our friend, Mark, yesterday on the street, and he said he hadn’t heard from you for two months.
Woman: Yes, I know. But I’ve been too busy to phone him.
Question: What can be inferred from the conversation().

A. The man saw Mark on the street two months ago.

B. The woman had forgotten Mark’s phone number.

C. The woman made a phone call to Mark yesterday.

D. Mark and the woman had not been in touch for some time.