在图所示的电路中,电源电压保持不变,R1为定值电阻,在滑动变阻器的滑片P从最右端

题型:选择题

问题:

在图所示的电路中,电源电压保持不变,R1为定值电阻,在滑动变阻器的滑片P从最右端移到中间某个位置时,电压表V1、V2的示数分别为U1、U2,电流表A的示数为I,滑动变阻器连入电路中的电阻为R2,三个电表的示数分别变化了ΔU1、ΔU2、ΔI。在以下四个表达式中,不正确的是:

[ ]

A.R1=

B.R2=

C.R1=

D.R2=

考点:欧姆定律及其应用
题型:选择题
A well-dressed(穿得好的) man goes into a restaurant one day. He sits _______at a table near the window.
A waiter comes up to him and says,“_____I help you, sir? ” The man says, “Can I see the menu?” “Certainly.” the man wants a good meal. He orders(点餐) a lot of delicious_____ . The waiter brings them to him. The man is having his _____ happily. At this time, a boy comes in and sits down beside the man. He asks the _____ to give him an ice cream. The man does so. Now the boy is eating his ice cream.
“I will go out _____ a newspaper.” the man says and leaves. After the boy eats his ice cream up, he _______ and goes to the door.
“______, your father has not given the money for the meal and your ice cream.” the waiter stops him and says.
“Father? You’re _____. He is not my father. I don’t _____ him. I meet him in the street. He says he will(会) give me an ice cream if I come here at twelve o’clock.” says the boy.
小题1:
A.inB.onC.downD.up
小题2:
A.CanB.MustC.ShouldD.Would
小题3:
A.chickenB.dishesC.saladD.vegetables
小题4:
A.cakesB.drinkC.supperD.meal
小题5:
A.manB.fatherC.waiter D.boy
小题6:
A.withB.forC.toD.at
小题7:
A.sits downB.gets upC.stands upD.comes down
小题8:
A.Excuse me B.Sorry C.HelloD.Hi
小题9:
A.goodB.rightC.wellD.wrong
小题10:
A.likeB.knowC.helpD.ask
题型:选择题

某妇女,29岁,1-0-2-1,曾患慢性肾炎,现停经69天,门诊检查诊断为早孕。

该妇女宜选择终止妊娠的方法是()。

A.药物流产

B.负压吸引术

C.钳刮术

D.利凡诺引产

E.水囊引产

题型:选择题

肾小管上皮细胞又称为________,尾形上皮细胞又称为________,鳞状上皮细胞又称为________。

题型:选择题

母亲长期营养不良,乳汁分泌量将(),但除()含量可降低外,其余基本保持稳定。

题型:选择题

道德具有以下特点()

A.阶级性

B.相对独立性

C.多层次性

D.广泛的社会性

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