下列四种生活生产应用中,其设计原理与其他三个不同的是( ) A.茶壶壶嘴 B.医

题型:选择题

问题:

下列四种生活生产应用中,其设计原理与其他三个不同的是(  )

A.茶壶壶嘴

B.医用注射器

C.锅炉液位计

D.船闸

考点:连通器原理及应用
题型:选择题

Dear Zhou Lan,

Thank you very much for your mail. I want to go to China. I know something about China from your e-mails. Your English is very good. But I don't know much Chinese. Now I'm learning it from my parents. They know much about China. They tell me many things about China.

I'm happy to know you like your school and your family. You want to know my family and my school. I have a big family. My grandparents and my parents are all very fine. My father has a brother. He is my uncle, John. He and my aunt have their children. They're Bill, Linda, Mary and Lily. My brother Dick is a boy of eighteen. I like my family very much. I'll go to China next year with my mother. She is going to teach English in a middle school in Beijing.

Yours,

Annie

小题1:This is an e-mail from _____ to _____.

A.Zhou Lan; Annie

B.Annie; Zhou Lan's family

C.Zhou Lan; Annie's family

D.Annie; Zhou Lan小题2:How old is Dick?

A.17

B.18

C.19

D.20小题3:How many people are there in Annie's big family?

A.4

B.6

C.12

D.14小题4:Who will come to China?

A.Annie

B.Annie's family

C.Annie and her mother

D.Annie's parents小题5:Who teaches Annie Chinese? (   )

A.Zhou Lan.

B.Annie's parents

C.Annie's grandparents

D.Annie herself

题型:选择题

质量为m的小物块,从离桌面高H处由静止下落,桌面离地面高为h,如图所示。如果以桌面为参考平面,那么小物块落地时的重力势能及整个过程中重力势能的变化分别是

[ ]

A.,减少  

B.,增力

C.,增加  

D.,减少

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依据生命周期理论,完善的社会保障系统对居民消费产生什么影响?为什么?

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安全电压的规定是以人体允许电流与人体电阻的()为依据的。

题型:选择题

气相中CO和()浓度提高对化学反应和扩散过程都是有利的。

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