造成放大器工作点不稳定的主要原因是电源电压波动。()

题型:判断题

问题:

造成放大器工作点不稳定的主要原因是电源电压波动。()

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题型:判断题
选词填空。
hot, cool, warm, cold, humid
1. It's                in summer in Australia.
2. It often rains these days so it's very            .
3. I like autumn(秋天) because it's            .
4. It is very          in winter in Harbin.
5. The weather is very           in spring in China.
题型:判断题

(2008•西宁)某钢瓶内所装氧气的密度为8kg/m3,一次电焊中用去,则瓶内剩余氧气的密度是     kg/m3,瓶内氧气的压强将     .(填“增大”“减小”或“不变”)

题型:判断题

如图所示,在铁芯P上绕着两个线圈a和b,则下列说法正确的是

A.线圈a输入正弦交变电流,线圈b可输出恒定电流

B.线圈a输入恒定电流,穿过线圈b的磁通量一定为零

C.线圈b输出的交变电流不对线圈a的磁场造成影响

D.线圈a的磁场变化时,线圈b中一定有电场

题型:判断题
阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
Brother Michael and Chris were born in the early 1960s and grew up in a black neighborhood in Richmond, California. Both boys were       in the primary school and brought home mostly A’s on their report cards.
But in a black family with eight children, money was always      , so the two growing boys often went      . They turned to stealing. They stole cookies from the grocery store and bread from the      . They even stole money from their parents to feed.
At the end of his first year in high school, Chris received three A’s and       F’s on his report card --- the first time he had       anything in school. Because Kennedy High School only allowed three failures       four years, one more F and Chris would be kicked out of school. That’s when he made up his mind to      .
Chris made every effort to become       in school. After Chris graduated from college, he worked as a prosecutor(检察官),       criminals, drug dealers, and gang members. Today Chris is famous as one of the       prosecutors in the trial of the century, the O.J. Simpson trial!
That decision to change took him in an entirely       direction from his brother Michael, who       changing his bad behavior. After high school, Michael continued his anti-social      ---fighting in the streets, taking       and stealing. At the age of 42, Michael Darden died from AIDS.
This story       us that what we become is determined by the       we make. We can choose to get       or we can choose to get worse. Chris changed. He changed from being a criminal to prosecuting criminals. His brother Michael, on the other hand, was changed. He was changed by       drugs…and finally, he was changed by a deadly disease. Chris made the right choices. He made the changes in his life that helped him       his great dreams.
小题1:
A.well- behavedB.well-dressedC.well-knownD.well- informed
小题2:
A.plentifulB.looseC.commonD.tight
小题3:
A.madB.wrongC.hungryD.bad
小题4:
A.chemist’sB.baker’s C.doctor’sD.barber’s
小题5:
A.twoB.threeC.fourD.five
小题6:
A.obtainedB.failed C.passedD.missed
小题7:
A.beyondB.byC.overD.above
小题8:
A.stealB.respondC.standD.change
小题9:
A.outstandingB.friendlyC.powerfulD.outgoing
小题10:
A.treatingB.savingC.questioningD.punishing
小题11:
A.leading B.workingC.actingD.performing
小题12:
A.similarB.differentC.newD.strange
小题13:
A.preferredB.resisted C.admittedD.appreciated
小题14:
A.habitsB.signsC.behaviors D.manners
小题15:
A.drugsB.actionsC.busesD.pills
小题16:
A.persuadesB.warnsC.convinces D.wishes
小题17:
A.choices B.friendsC.promisesD.efforts
小题18:
A.tallerB.cleanerC.happierD.better
小题19:
A.illegal B.usefulC.harmlessD.lawful
小题20:
A.destroyB.formC.accomplishD.approach
题型:判断题

2005年5月1日,英国短期市场的存款利率为年息9%,美国的短期存款利率为年息11%,外汇市场的汇率是GBP/USD=1·6651/81,英国一套利者有100000英镑,如果汇率不变,该套利者如何进行无风险套利?收益如何?假设如上6个月到期时,英镑汇率升至GBP=USD1·8001,情况怎样?

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