问题
单项选择题
水泵叶轮相似定律的第三定律（功率相似定律），N～n的关系为（）。
A.A
B.B
C.C
D.D
答案
参考答案：B
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水泵叶轮相似定律的第三定律（功率相似定律），N～n的关系为（）。
A.A
B.B
C.C
D.D
参考答案：B
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| I grew up in an ordinary family,which is not so well off.I could understand the__1__ my parents were bearing at that time.__2__,I work very hard now in the hope of entering the university and change the__3__of my family and me. I think that in a certain sense,difficult situations can__4__a person's potential and pave the way for him to__5__.One can be strong,brave and__6__after all these hardships he has__7__. All in all,I think that flowers from a greenhouse can never__8__a storm and tha  t ahard life is good for children. So I think parents should make their children grow strong, by helping them experience life in bad conditions,__9__a child will value the labour and be capable of facing hardship. I lived a happy childhood.Not only did my parents love me from the__10__of their hearts,but also they gave me chances to increase my ability. My parents__11__primary importance to the management of my pocket money,which led to the__12__that often I could only watch my friends eating candies with my empty pocket.This experience helped me__13__the truth that my parents worked hard to earn a life,and so would I in the future. As the saying__14__"No pains,no gains."It is__15__ that the way one lives in his childhood plays an important part in his development.If one is__36__in a family that is wasteful,he is likely to be lazy when he grows up.__17__,a child who lives a hard life in his childhood,learning that one must be independent and frugal to face the challenge,is__18__be strong.On parents' part,they can teach the child to help support the family.More can be done__19__food,hard work and bad conditions. Instead of being__20__,children should eat bitter food to learn to be frugal,do hard work to learn to cherish,and be sent to somewhere tough to learn to be brave. | |||
| ( )1. A．poverty ( )2．A.However ( )3. A．situation ( ) 4．A.seek ( )5. A．failure ( )6．A.awful ( )7．A.looked through ( )8.A.understand ( )9．A.to which ( )10．A.bottom ( )11．A.approached ( )12．A.experience ( )13．A.realized ( )14. A．says ( )15. A．various ( )16. A．brought in ( )17. A．On the contrary ( )18. A．ready to ( )19. A．away from ( )20. A．accustomed | B．thoughts B．Therefore B．state B．stimulate B．success B．careful B．got through B．withstand B．at which B．top B．attained B．evidence B．recognized B．goes B．serious B．brought up B．On earth B．anxious to B．apart from B．ashamed | C．richness C．Besides C．location C．shape C．pleasure C．merciful C．put through C．enjoy C．which C．centre C．attached C．convenience C．admitted C．states C．obvious C．brought about C．On the whole C．determined to C．except C．spoiled | D．hardships D．Otherwise D．position D．secure D．recreation D．faithful D．gone through D．outstand D．with which D．tip D．attempted D．consequence D．reflected D．explains D．tedious D．brought out D．What's worse D．bound to D．more than D．puzzled |