如图为理想变压器原线圈所接交流电压的波形.原、副线圈匝数比n1:n2=10:1,

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问题:

如图为理想变压器原线圈所接交流电压的波形.原、副线圈匝数比n1:n2=10:1,串联在原线圈电路中电流表的示数为1A,下列说法正确的是(  )

A.变压器输出端所接电压表的示数为20V

B.变压器的输出功率为200W

C.变压器输出端的交流电的频率为50Hz

D.穿过变压器铁芯的磁通量变化率的最大值为20/n2Wb/s

考点:变压器的结构和原理
题型:多选题
There          many new ways of shopping, and online shopping is one of them. You can buy almost everything on the Internet, and it's very          . First, you choose something. Then you receive it a few days later             post. Online shopping has several            .First, you can shop at any time. The shops are always            . Second, shopping usually takes a lot of time. But to shop on the Internet you only need a computer and a mouse! You can          compare the prices of the same product and spend a lot …or save money. But many people enjoy        out and shopping with friends. They don't like shopping on the Internet because they can't see the product or            the clothes on. Also paying over the Internet isn't always safe. Online shopping is changing our way of life. One day            will go to the shops any more,
          you'll be able to buy anything on the Internet, and you will be able to receive it anywhere in the world at any time!
小题1:
A.isB.wasC.areD.be
小题2:
A.easyB.differentC.difficultD.bad
小题3:
A.onB.toC.byD.and
小题4:
A.advantageB.disadvantagesC.disadvantageD.advantages
小题5:
A.openB. opensC.closeD.closes
小题6:
A.tooB.alsoC.as wellD.either
小题7:
A.goesB.goingC.goD.to go
小题8:
A.tryB.putC.lookD.take
小题9:
A.nothingB.everythingC.everyoneD.no one
小题10:
A.soB.andC.becauseD.then
题型:多选题

在软件测试设计中,软件测试的主要目的是

A.实验性运行软件

B.证明软件正确

C.找出软件中的全部错误

D.发现软件错误而执行程序

题型:多选题

资本家在不延长工作日的情况下通过提高劳动生产率获得的是()

A.绝对剩余价值

B.相对剩余价值

C.垄断利润

D.平均利润

题型:多选题

一个质量为0.5kg的物体从静止开始做匀加速直线运动,经过10m的位移速度大小为10m/s,则物体的加速度大小为______m/s2,受到的合力大小为______N.

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某年3月,某村村民老王雇人在自己的宅基地上建造了两间平房。不幸老王遭遇车祸去世,儿子小王依法继承了父亲的两间平房。同年7月,小王决定将两间平房出售,并与同村的小李签订了房屋买卖合同。以下说法正确的是哪一项( )

A.老王自房屋建造完成时取得所有权,无须经过登记
B.小王继承父亲的房屋,须办理过户手续才能取得所有权
C.小王与小李签订房屋买卖合同属于无权处分行为
D.小李自买卖合同生效时起取得房屋所有权,无须经过登记

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