“探究串联电路电压的规律”实验中: (1)用电压表测灯L2两端的电压,连接电路如

题型:实验题

问题:

“探究串联电路电压的规律”实验中:

(1)用电压表测灯L2两端的电压,连接电路如图甲所示。图中只有一根导线连错了,请你在连错的导线上画“×”,并画出正确的电路连接。

(2)改正电路后,闭合开关。如图乙所示,电压表的示数为 _________ V,若电源电压为

3V,则灯L1两端的电压是_________V。

(3)如图所示的电阻箱,其表示的电阻大小为                   欧姆。

考点:串联电路的电压规律电路故障分析电阻箱电压的测量,电压表的使用
题型:实验题

简述产品组合策略类型。

题型:实验题

我国成功发射了“嫦娥一号”月球探测卫星。人类探测月球发现,其土壤中存在较丰富的质量数为3的氦元素,它可以作为核聚变的重要原料之一。以下关于3He的说法正确的是

A.是4He的同分异构体

B.比4He多一个中子

C.是4He的同位素

D.比4He少一个质子

题型:实验题
Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in the blank with the word or phrase that best fits the context.
Recently I overheard a father and daughter in their last moments together at the airport. The airline had announced her        and standing near the security gate, they hugged and he said, “I love you. I wish you enough.” She        said, “Dad, our life together has been more than enough. Your love is all I ever needed. I wish you enough, too, Dad.” They kissed and she left.
He walked over toward the window where I was seated. Standing there I could see he wanted and needed to       . I tried not to interrupt him, but he        me in by asking, “Did you ever say good-bye to someone knowing it would be forever?”
“Yes, I have,” I replied. “Forgive me for asking, but why is this a forever good-bye?” “I am        and she lives much too far away. I have        ahead, and the reality is, the next trip back will be for my funeral” he said.
“When you were saying good-bye I heard you say, ‘I wish you enough’. May I ask what that means?”
He began to smile. “That’s a wish that has been        for many generations within my family. My parents        say it to everyone.”
He paused for a moment, looking up as if trying to remember it       , and then he smiled and        the following:
  “I wish you enough sun to keep your attitude bright.
  I wish you enough rain to appreciate the sun more.
  I wish you enough happiness to keep your spirit alive.
  I wish you enough pain so that the smallest joys in life appear much       .
  I wish you enough gain to satisfy your wanting.
  I wish you enough        to appreciate all that you possess.
  I wish you enough ‘Hellos’ to get you enough the final ‘Good-byes’.”
  Then he walked away, leaving me lost in thought.
小题1:
A.arrivalB.regretC.departureD.joy
小题2:
A.in generalB.in publicC.in particularD.in turn
小题3:
A.cryB.restC.sit downD.talk
小题4:
A.showedB.ledC.tookD.welcomed
小题5:
A.illB.strongC.oldD.brave
小题6:
A.storiesB.challengesC.tripsD.jobs
小题7:
A.handed overB.handed downC.handed inD.handed out
小题8:
A.ought toB.had toC.used toD.were able to
小题9:
A.in detailB.in heartC.in memoryD.in general
小题10:
A.talkedB.sharedC.criedD.declared
小题11:
A.bigger B.worseC.sweeterD.better
小题12:
A.successB.gainC.sorrowD.loss
题型:实验题

二尖瓣狭窄出现颈静脉怒张、肝肿大压痛是由于()

A.体循环淤血

B.肺循环淤血

C.左心房扩大所致的压迫症状

D.肺动脉高压

E.肺梗死

题型:实验题

数字无绳电话系统主要由手机、基站、网络管理中心和()组成

A、用户数据存储器

B、鉴权中心

C、计费中心

D、设备管理器

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