题目内容
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[单选题]
In an AC motor you send electricity power to to generate magnetic field.
A.stator coil
B.rotor coil
C.commutator
D.brushes
提问人：网友zhanwanzi252
发布时间：2022-01-07
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A、symptom
B、signs
C、pain
D、the medicine
题目内容
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Attempts to get supplies to the region are ________ because troops will not allow the aid convoy to enter the city.
A、fruitful
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C、furious
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A、signal-to-noise ratio
B、topology
C、signal intensity
D、noise intensity
第4题
（ ）Usually you will not get a shockBy touching the electric ray in one place onlyBe．cause__________．
点击查看答案
A.a torped0’s electric cells contain more than one electricDlates
B.to complete the circuit，you have to touch the fish in twoDlaces
C.the current in one place is not strong enough to give a shock
D.the fish’s electric cells are filled with jelly-like substance
第6题
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第7题
根据下列材料回答下列各 题。 The idea of a fishBeing able to generate electricity strong enough to light lampBulbs—oreven to mn a small electric motoris almost unbelievable，but several kinds of fish are able todo this．Even more strangely。this curious power hasBeen acquired inDifferent waysBy fishBe。longing to veryDifferent families． Perhaps theBest known are the electric rays，or torpedoes(电鱼)，of which several kindslive in warm seas,They posses on each side of the head，behind the eyes，a large organ consis—ting of a number of hexagonal shaped cells rather like a honeycomb．The cells are filled with ajeUy—like substance，and contain a series of flat electric plates．One side，the negative side，ofeach plate．is supplied with very fine nerves，connected with a main nerve coming from a specialpart of theBrain．Current passes from the upper，positive side of the organDownwards to thenegative，lower side．Generally it is necessary to touch the fish in two places，completing the cir-cuit，in order to receive a shock． The strength of this shockDepends on the size of the fish，but newlyBorn ones only about5 centimeters across canBe made to light theBulb of a pocket flashlight for a few moments， while a fully grown torpedo gives a shock capable of knocking a manDown，and，if suitablewires are connected，will operate a small electric motor for several minutes． Another famous example is the electriceel．This fish gives an even more poweIful shock．The system i8Different from that of the torped。in that the electric plates run longitudinally(纵向)and ale supplied with nerves from the spinal(脊骨)cord．Consequefitly，the current passesalong the fish from head to tail．The electric or gans of these fish are really altered muscles andlike all muscles are apt(1ikely)to tire，so they are not able to produce electricity for very long．The power of producing electricity may serve these flshBom forDefence and attack． （ ）It canBe seen from the passage that__________．
点击查看答案
A.the torpedo’s electric ceils have a shape with six sides
B.some fish can produce enough electricity toDrive a number of electric motors
C.the current travels in an upwardDirection from the positive side to negative sidein torpedo’s electric cells
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第8题
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The idea that electricity cannot be created or destroyed may seem to imply that electrons and protons cannot be created or destroyed.
第10题
Exercise makes your muscles strong enough to avoid (5)_____ during sports
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