下列结论:①(3)′=0,②(sinx)′=cosx,③(ex)′=ex,④(l

题型:选择题

问题:

下列结论:①(3)′=0,②(sinx)′=cosx,③(ex)′=ex,④(lnx)′=
1
x
,其中正确的个数是(  )
A.1B.2C.3D.4
考点:导数的运算
题型:选择题

读对话,回答问题或判断正(T)误(F)。

— What do you want for the barbecue?

— Hmm. How about chicken and hamburgers? 

— OK, we have some chicken in the freezer, but we don't have any hamburger meat. 

— And there aren't any hamburger rolls. 

— Do we have any soda?

— No, we don't. We need some. Oh, and let's get some lemonade, too. 

— All right. And how about potato salad?

— Oh, yeah. Everyone likes potato salad.

( ) 1. They don't have hamburger meat in the freezer.

( ) 2. But they have some hamburger rolls.

( ) 3. They have some soda.

( ) 4. They like potato salad very much.

5. How many kinds of drinks do they want for the barbecue? And what are they?

                                                                                                                           

6. You'll have a barbecue this weekend, what food and drink would you like to bring? 

                                                                                                                           

题型:选择题

到目前为止,类风湿性关节炎的病因被认为是()

A.感染

B.家族遗传

C.免疫功能紊乱

D.受风、潮湿、寒冷等环境因素影响

E.仍不明

题型:选择题

合同履行中行使先履行抗辩权的方式是()。

A.不履行合同

B.终止履行合同

C.中止履行合同

D.要求对方履行合同

题型:选择题

下列关于矩阵管理制特征的描述中,说法正确的是( )。

A.工作人员属于两个领导部门,其从属具有多重性

B.适应于生产经营复杂多变的企业

C.具有较大的适应性、灵活性

D.矩阵结构是固定的,各专案规划的项目也是固定的

题型:选择题

下列关于受精作用及结果的叙述,正确的是()

A.精卵相互融合的基础是细胞膜的流动性

B.后代从双亲各获得一半的DNA

C.使后代产生不同于双亲的基因组合

D.后代继承了双亲的全部遗传性状

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