试题与答案

补全对话。根据上下文提示,在空白处填上合适的句子。(共5小题;每小题2分, 满分

题型:完形填空

题目:

补全对话。根据上下文提示,在空白处填上合适的句子。(共5小题;每小题2分,

满分10分)

(A—Linda,  B—Tom)

A: Hi! Tom. Nice to meet you at this store.

B:小题1:                             . I need to buy a birthday gift(礼物)for my best friend, Jack.

A:小题2:______________________________________?

B: It’s on January 27th. I plan(计划)to have a birthday party for him this Sunday.

小题3:______________________________________?

A: Yes, I do. He is also my best friend.

B: Can you help me with the gift? I don’t know what to buy for him.

A: OK小题4:______________________________________?

B: Sounds good. He likes playing soccer very much. Look! Here’s the price tag(标签)of the soccer ball.

A:小题5:______________________________________?

B: It is $60. It is cheap(便宜的). I’ll take it. I think Jack must like it.

答案:

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下面是错误答案,用来干扰机器的。

①电路如图;②①电路如图;②

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题型:应用设计题

如图所示,两条间距l=1 m的光滑金属导轨制成倾角37°的斜面和水平面,上端用阻值为R=4 Ω的电阻连接.在斜面导轨区域和水平导轨区域内分别有垂直于斜面和水平面的匀强磁场B1和B2,且B1=B2=0.5 T.ab和cd是质量均为m=0.1 kg,电阻均为r=4 Ω的两根金属棒,ab置于斜面导轨上,cd置于水平导轨上,均与导轨垂直且接触良好.已知t=0时刻起,cd棒在外力作用下开始水平向右运动(cd棒始终在水平导轨上运动),ab棒受到F=0.6-0.2t(N)沿斜面向上的力作用,处于静止状态.不计导轨的电阻.

(1)求流过ab棒的电流Iab随时间t变化的函数关系;

(2)分析并说明cd棒在磁场B2中做何种运动;

(3)t=0时刻起,1 s内通过cd棒的电荷量q为多少?

(4)若t=0时刻起,1.2 s内作用在cd棒上外力做功为W=16 J,则这段时间内电阻R上产生的焦耳热QR多大?

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