设一个三次函数的导数为x2-2x-8,则该函数的极大值与极小值的差是:() A.-3

题型:单项选择题

问题:

设一个三次函数的导数为x2-2x-8,则该函数的极大值与极小值的差是:()

A.-36

B.12

C.36

D.以上都不对

考点:一级结构工程师基础知识高等数学高等数学题库
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某同学做了一个趣味实验(装置气密性良好)。整个实验过程如图所示:待试管冷却至室温,在水中取下胶塞,试管中液面上升(如图B所示)。请用理化知识解释试管中液面上升的原因_____________。

题型:单项选择题

(B)

Sixty-year-old grandmother, Fiona McFee, is going to stop working next year and she decided to realize a childhood dream and sail around the coast of Scotland in a small boat. Although the inside of the boat is very cosy it has no running water or electricity. Fiona says she can live without these things but she plans to take her small CD player, her hot water bottle and a bag of books to make sure life isn’t too uncomfortable.

We asked her if she was afraid of being at sea for so long. She said, “Well, I’m going to take a good compass (指南针). Anyway I’m not afraid of death because I love the sea---I just hope it loves me.” Fiona certainly has plenty of energy; in her spare time, she enjoys playing the piano, rock-climbing, canoeing and dancing. Although she is sixty, she doesn’t want to have a quiet and peaceful life. “I’m looking forward to having fun in the rest of my life and that’s exactly why I’d like to be a sailor for a while.”

小题1:The underlined word cosy in the first paragraph means ____ .

A.bright

B.dirty

C.comfortable

D.dark小题2:When Fiona McFee said “---I just hope it loves me.” What she meant was ____

A.Of course , it loves me , since I love it .

B.If I love it , it should love me.

C.I hope it will bring me a safe sailing as a return for my love of it .

D.I hope it will save my life when I am in time of danger .小题3: The reason why she would like to have the sail is that ____.

A.she thinks it will be very exciting

B.she likes sports and enjoys canoeing

C.she has decided to realize a childhood dream

D.she wants to be still active when she gets old小题4:What kind of person would you say the old woman is ?

A.Someone who does not show what she is feeling .

B.Someone who is very proud and sure of her success .

C.Someone who doesn’t use her head much .

D.Someone who is open , honest and brave .小题5:The best title for this passage is ____ .

A.Life Begins at Sixty

B.A Round Coast Sail

C.An Old Woman Sailor

D.An Unusual Hobby(爱好)

题型:单项选择题

下列各组液体混合物,能用分液漏斗分离的是

A.醋酸和水

B.四氯化碳和水

C.汽油和苯

D.酒精和水

题型:单项选择题

刮板输送机安装电缆槽时,必须将电缆槽与()对正并用螺栓紧固。

A.溜槽销

B.溜槽孔

C.夹板

D.定位销

题型:单项选择题

津液排泄途径中,起关键作用的是()

A.汗

B.尿

C.粪

D.呼气

E.以上均非

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