如图是利用太阳能驱动小车的装置,若小车在平直的水泥路上从静止开始加速行驶,经过时

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问题:

如图是利用太阳能驱动小车的装置,若小车在平直的水泥路上从静止开始加速行驶,经过时间t 前进距离s,速度达到最大值vm,在这一过程中电动机的功率恒为P,小车所受阻力恒为F,那么这段时间内(  )

A.小车做匀加速运动

B.电动机所做的功为 Pt

C.电动机所做的功为

1
2
m
v2m

D.电动机所做的功为FS+

1
2
v2m

考点:平均功率和瞬时功率的区别动能定理
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An 80-year-old man was sitting in his house beside his 45-year-old son. Suddenly a crow landed in front of the window. The father 16 his son, "What is that?" The son replied, "It is a crow."17 a few minutes, the father asked his son a second time, "What is that?" The son said "I just 18 you that it’s a crow." After a little 19 , the father again asked his son, "What is that?" That time a(n) 20 tone could be heard in the son’s 21 . "It’s a crow, a crow!"
A little later, the father went to his room and 22 with an old diary which he had 23 for many years. After opening the right page, he asked his son to 24 it. When the son read it, tears came to his eyes." Today my 25 was sitting with me on the sofa.
When a crow was 26 by the window, my son asked me 23 times what it was, and I 27 to him all 23 times that it was a crow. I hugged him 28 each time he asked me the same question. I did not feel 29 answering the same question." If your 30 become old, don’t treat them or look 31 them as a burden(累赘). Instead be warm and 32 to them. From today on say this to yourself, "I want to 33 my parents happy forever, for they have 34 for me ever since I was born, and they have always showed their 35 love to me."
小题1:
A.demandedB.askedC.commandedD.tested
小题2:
A.BeforeB.DuringC.AfterD.Within
小题3:
A.toldB.remindedC.calledD.consulted
小题4:
A.sighB.doubtC.breathD.while
小题5:
A.sadB.angryC.pitifulD.gentle
小题6:
A.faceB.mindC.voiceD.pace
小题7:
A.came upB.came outC.came backD.came on
小题8:
A.keptB.gatheredC.collectedD.searched
小题9:
A.tearB.readC.writeD.recite
小题10:
A.sonB.daughterC.brotherD.father
小题11:
A.lyingB.wipingC.sittingD.spying
小题12:
A.requiredB.repeatedC.recalledD.replied
小题13:
A.lovinglyB.carefullyC.deeplyD.lightly
小题14:
A.puzzledB.worriedC.amazedD.annoyed
小题15:
A.parentsB.relativesC.familiesD.teachers
小题16:
A.upB.uponC.downD.into
小题17:
A.wiseB.kindC.strictD.generous
小题18:
A.sendB.prayC.ownD.see
小题19:
A.frightenedB.huntedC.caredD.waited
小题20:
A.pleasantB.limitedC.usefulD.selfless
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离心泵轴承处温度超过()℃时,属于离心泵轴承温度过高,应处理。

A、60

B、65

C、75

D、80

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烧伤后急性呼吸窘迫综合征(ARDS)诊断原则是()

A.氧合指数小于200mmHg

B.急性起病

C.X线胸片双肺浸润影

D.肺动脉楔压(PAWP)小于18mmHg

E.临床表现及以上各项综合考虑

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设备正常运行时,称重给煤机堵塞或马达跳闸会造成什么后果?()

A、旋转卸料阀停转

B、磨机断煤

C、磨机堵塞

D、磨机跑煤

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简述精神分裂症四种主要类型的区别。

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