溢流阀的主要作用有( )。A.溢出液压系统中多余液压油 B.使液压系统中保持一定压

题型:多项选择题

问题:

溢流阀的主要作用有( )。

A.溢出液压系统中多余液压油

B.使液压系统中保持一定压力

C.防止液压系统过载

D.控制液压系统各元件动作的先后顺序

E.控制油液流动方向

考点:资产评估师机电设备评估基础机电设备评估基础
题型:多项选择题
Monty was the son of a horse trainer. When he was in his ninth grade, he was asked to write a __31__ about what he wanted to be and do when he grew up.
That night he wrote a seven-page paper saying that someday he’d __32__ a horse ranch (牧场). He wrote about his dream in great detail and he __33__ drew a picture of a 200-acre ranch with all the buildings.
He put a great deal of his __34__ into the project and the next day he handed it in __35__ his teacher. Two days later he received his paper back. On the front page was a large red F with a __36__ that read, “See me after class.”
The boy with the dream went to see the teacher after class and asked, “__37__ did I receive an F?”
The teacher said, “This is an __38__ dream for a young boy like you. You come from a poor family. Owning a horse ranch requires a lot of __39__. You have to buy the land. You have to pay for other things. There is no__40__ you could ever do it.” Then the teacher added, “__41__ you rewrite this paper with a more realisticgoal, I will reconsider your grade.”
The boy went home and thought about __42__ long and hard. He asked his father what he should do. His father said, “Look, son, you have to make up your own mind on this. However, I think it is a very important __43__ for you.”
Finally, after sitting with it for a week, the boy turned in the __44__ paper, making no changes at all. He said to the teacher, “You can keep the F and I’ll keep my   45 .”
小题1:
A.speechB.paperC.noticeD.diary
小题2:
A.paintB.winC.ownD.sell
小题3:
A.justB.almostC.everD.even
小题4:
A.heartB.lifeC.adviceD.trust
小题5:
A.toB.withC.fromD.for
小题6:
A.wordB.letterC.noteD.post
小题7:
A.HowB.WhyC.When D.Where
小题8:
A.unusualB.unforgettableC.unimportantD.unrealistic
小题9:
A.moneyB.timeC.spaceD.effort
小题10:
A.wonderB.wayC.problemD.matter
小题11:
A.ThoughB.sinceC.UntilD.If
小题12:
A.himselfB.himC.itD.itself
小题13:
A.changeB.giftC.messageD.decision
小题14:
A.longB.thickC.sameD.correct
小题15:
A.gradeB.dreamC.dutyD.secret
题型:多项选择题

流行病学研究的对象是

A.病人

B.非病人

C.人群

D.个体

E.病原携带者

题型:多项选择题

食品污染物指不是有意加入食品中,而是在生产、制造、加工、调制、处理、填充、包装、运输和贮藏等过程中带入食品中,或是由于环境污染带入食品中的任何物质。

下列属于食品污染物的是()。

A.“三鹿奶粉”事件中“问题奶粉”含有三聚氰胺成分

B.对肉质进行嫩化改良而使用的木瓜蛋白酶成分

C.油炸食品在加工过程中由于加入增多剂而产生的铝成分

D.食品腌制中,使用的添加剂中含有的对人体有害的亚硝酸盐

题型:多项选择题

鼠,昼伏夜动,不穴于寝庙,畏人故也。

题型:多项选择题

产生行为的内在原因是()。

A.需要

B.动机

C.激励

D.权利

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